Make 6 different Halloween-themed cookies with one batch of dough! These festive Halloween Cookie Bars bake up in one sheet pan for cookies so delicious and easy, it’s almost scary.

Spooktacularly Easy Halloween Cookie Bars: Six Flavors, One Pan!

Get ready to conjure up some magic in your kitchen this Halloween with our incredible Halloween Cookie Bars recipe! Imagine baking not one, but six distinct, deliciously spooky cookie flavors, all from a single batch of dough and baked effortlessly in just one sheet pan. This recipe is an absolute game-changer for any Halloween gathering, promising an array of festive treats that are as delightful to look at as they are to devour. Say goodbye to endless baking sheets and multiple batches; these cookie bars make holiday entertaining frightfully simple and fun, leaving you more time to enjoy the festivities with your loved ones.

Unleash Your Inner Halloween Baker with These Festive Cookie Bars

Whether you’re hosting a grand Halloween party, planning a cozy movie night with spooky snacks, or just looking for a fun and engaging activity with the kids, these Halloween Cookie Bars are your perfect solution. Their innovative “six-in-one” design means you can cater to every taste bud and theme without extra effort. From ghoulish graveyards adorned with gummy worms to monstrous M&M creations bursting with color, each section offers a unique theme and flavor profile. This ensures there’s a favorite for every ghost, goblin, and ghoul at your celebration, making them the ultimate party treat. Not only are they incredibly cute and visually appealing, but they’re also designed to feed an army of party-goers, making them both charming and practical.

Discover the enchanting variety of flavors you can create, all in one go, transforming a single dough into a diverse dessert platter:

• Monster Mash M&M Bars: A vibrant and colorful explosion of classic chocolate chips, Halloween-themed M&M’s in festive orange, purple, and black hues, and a playful scattering of spooky sprinkles. These bars are a true crowd-pleaser, delivering rich chocolatey goodness with a satisfying candy crunch, perfect for a monster-themed party.
• Scary S’mores Bars: Recreate the cozy campfire classic with a delightfully spooky twist! This section features golden graham cracker crumbs for that authentic base, rich Hershey’s chocolate chunks that melt into gooey perfection, fluffy mini marshmallows that toast beautifully, and whimsical candy eyeballs that stare back at you, adding a touch of playful fright.
• Cookies and Cream “Graveyard” Bars: A deliciously dark and eerie treat made with chopped Halloween Oreos, creating a rich, satisfying cookies and cream base. This section is ingeniously garnished with crushed Oreos to mimic freshly dug “dirt” and completed with sour gummy worms crawling on top, making for a playful yet decadent graveyard scene.
• Witch’s Brew Peanut Butter Bars: A magical concoction of creamy peanut butter, vibrant and colorful Reese’s Pieces, and savory broken pretzel sticks. This enchanting blend offers a perfect balance of sweet and salty, creating a truly irresistible flavor combination that’s both comforting and exciting, reminiscent of a witch’s bubbling cauldron.
• Candy Corn Blondie Bars: Embrace the iconic Halloween candy with these delightful blondie bars. Loaded with sweet white chocolate chips for a creamy texture and classic candy corn, they offer a wonderfully chewy texture and a distinct seasonal sweetness that perfectly captures the spirit of autumn. Their vibrant colors make them a festive addition to any spread.
• Nutella Spiderweb Bars: Indulge in the rich, deeply chocolatey hazelnut flavor of Nutella, providing a luxurious base for this elegant and spooky treat. These bars are then elegantly adorned with a piped white icing spiderweb design and topped with a charming Oreo spider, complete with pretzel stick legs, transforming them into a visual and flavorful masterpiece.

For your convenience, I’ve compiled a comprehensive list of all necessary ingredients and essential baking tools. You can find everything you need linked directly on my LTK page!

Effortless Entertaining: Why Sheet Pan Cookie Bars Are a Host’s Dream

As a passionate baker and frequent host, I’ve discovered the unparalleled joy and ease of sheet pan treats, especially when my home is bustling with guests. These versatile desserts transform holiday gatherings, impromptu sleepovers, and spirited birthday celebrations into sweet, stress-free occasions. My Sheet Pan Chocolate Chip Cookie Bars are legendary among my friends and family for their incredibly soft, chewy texture and their impressive speed, going from oven to table in just 20 minutes. Similarly, my Frosted Sugar Cookie Bars are renowned for being the simplest and most delicious sugar cookies you’ll ever bake, requiring minimal effort for maximum impact. But the moment I perfected these 6-in-1 Sheet Pan Halloween Cookie Bars, I knew I had stumbled upon something truly extraordinary. Imagine the delight and convenience of serving six distinct types of cookies, all baked to perfection in a single pan – it simply doesn’t get any easier or more impressive than that! This method drastically cuts down on prep time and cleanup, allowing you to actually enjoy your own party.

Essential Ingredients and Supplies for Your Spooky Bake

To embark on this exciting Halloween baking adventure, you’ll need a collection of standard, high-quality baking ingredients and a few key kitchen tools. For precise measurements and more detailed instructions on quantities, please refer to the comprehensive recipe card located at the very end of this post. If you’re keen to deepen your understanding of how various baking ingredients function and contribute to the magic in your kitchen, I highly recommend consulting my in-depth Complete Guide to Baking Ingredients.

Core Cookie Dough Ingredients:

• Unsalted Butter: The foundation of rich, tender cookie bars. Butter provides essential moisture, a luxurious richness, and contributes significantly to both the delicate tenderness and the satisfying chewy texture we all crave. Opting for unsalted butter gives you precise control over the overall saltiness of your recipe. If salted butter is your only option, consider slightly reducing the amount of added salt in the dough to maintain the perfect flavor balance. Ensure it’s softened to room temperature for optimal creaming.
• Granulated Sugar: Beyond its primary role in sweetening, granulated sugar plays a crucial role in the texture of these bars. It helps to create that desirable slightly crisp top layer, while also contributing to the overall structure and promoting beautiful golden-brown edges during baking. It interacts with butter during creaming to aerate the dough.
• Light Brown Sugar: A true secret weapon for achieving wonderfully chewy cookies and bars. Thanks to its molasses content, light brown sugar not only adds a deeper, more complex sweetness compared to granulated sugar but also infuses the dough with much-needed moisture, guaranteeing a wonderfully soft and satisfyingly chewy texture. For an even richer, more pronounced flavor, you could experiment with dark brown sugar, though it will impart a slightly stronger, more caramel-like taste.
• Large Eggs: Eggs are the indispensable binding agents that hold all the delightful ingredients of your cookie dough together. They add essential moisture, contributing to the dough’s richness and providing crucial structure. Eggs also help to emulsify the fats and liquids, creating a smooth, cohesive dough and a more uniform crumb.
• Pure Vanilla Extract: Far more than just a flavor, vanilla extract is a powerful enhancer that elevates and harmonizes all the other ingredients in your cookie bars. It balances the sweetness, adds a warm, aromatic depth, and rounds out the complex flavors, making your cookie bars truly irresistible and giving them that classic bakery-quality taste.
• All-Purpose Flour: The structural backbone of your cookie bars. All-purpose flour provides the necessary body and framework, allowing the dough to hold its shape during baking and creating that perfect tender crumb that crumbles beautifully in your mouth. It’s important to measure it correctly to avoid dense or dry bars.
• Baking Soda: Our essential leavening agent. Baking soda reacts with acidic ingredients present in the dough (like brown sugar or cocoa powder if using) to produce carbon dioxide gas. This creates small air pockets that help the cookie bars rise slightly, contributing to their tender, slightly airy texture and a characteristic chewiness.
• Kosher Salt: A pinch of salt is crucial for balancing the sweetness and intensifying all the other flavors in the dough. It brightens the taste profile, preventing the bars from being overly sweet or bland. Keep in mind that Kosher salt has larger crystals and a milder saltiness than fine table salt; if you only have table salt, reduce the amount by half to avoid over-salting.

Frightfully Fun Mix-In Ingredients:

• Monster Mash M&M’s Bars:
  • Semi-Sweet Chocolate Baking Chips: For classic, rich chocolatey goodness that melts beautifully into the cookie dough.
  • Halloween-Colored M&M’s: Adding a vibrant pop of festive color and a delightful candy crunch to each bite, plus extra for eye-catching garnishing.
  • Halloween-Themed Sprinkles: The perfect whimsical and sparkling touch for garnishing, enhancing the festive appearance.
• Scary S’mores Bars:
  • Graham Cracker Crumbs: Essential for capturing that authentic, nostalgic s’mores flavor and delicate texture.
  • Hershey’s Chocolate Bar (broken into chunks): The quintessential chocolate for melting into deliciously gooey perfection within the bars.
  • Mini Marshmallows: For that signature toasted, chewy s’mores experience that gets wonderfully soft and slightly browned.
  • Candy Eyeballs: The essential spooky garnish, making your s’mores bars truly “scary” and fun.
• Cookies & Cream “Graveyard” Bars:
  • Halloween Oreos (chopped): Providing the distinctive rich chocolate cookie and sweet cream filling that defines this beloved flavor.
  • Oreos (crushed): Used as edible “dirt” for the realistic and spooky graveyard effect.
  • Sour Bright Green & Orange Gummy Worms: The perfect squiggly, colorful inhabitants for your eerie cookie graveyard.
• Witch’s Brew Peanut Butter Bars:
  • Creamy Peanut Butter: The star ingredient, offering its classic, comforting flavor and contributing to a wonderfully soft and moist texture.
  • Reese’s Pieces Candies: Adding vibrant color, a delightful crunch, and that unmistakable peanut butter cup flavor to the mix.
  • Broken Pretzel Sticks: Introducing a crucial salty crunch that perfectly complements and balances the sweetness of the peanut butter and candies.
• Candy Corn Blondie Bars:
  • White Chocolate Chips: For a sweet, creamy melt and a beautiful, contrasting visual appeal within the blondie base.
  • Candy Corn: The seasonal star, adding its unique, distinctive flavor and iconic tri-color appearance, a true nod to Halloween.
• Nutella Spiderweb Bars:
  • Nutella Chocolate Hazelnut Spread: Providing a rich, deeply satisfying chocolate-hazelnut base for an elegant and decadently delicious treat.
  • White Cookie Icing: Essential for creating the intricate and delicate spiderweb design that transforms these bars into a spooky masterpiece.
  • Oreo Cookie: Used to craft the adorable, edible spider centerpiece, adding a playful touch.
  • Pretzel Sticks: Halved and cleverly used as the “legs” for your charming Oreo spider, bringing it to life.

Essential Baking Supplies:

• 17″ x 12″ Rimmed Sheet Pan: The star of the show, this large sheet pan is absolutely crucial as it allows you to bake all six distinct flavors simultaneously, saving time and effort.
• Non-Stick Cooking Spray: Essential for ensuring that your delicious cookie bars release easily and cleanly from the pan after baking, preventing any sticking or breakage.
• Electric Mixer (fitted with the paddle attachment): For effortlessly creaming together the butter and sugars, ensuring a smooth, light, and well-combined dough base. A stand mixer is ideal, but a hand mixer will also work.
• Several Small Mixing Bowls: Crucial for efficiently dividing the base dough and incorporating the unique mix-ins for each of the six distinct flavors without any cross-contamination, keeping the flavors pure and separate.

Step-by-Step Guide: How to Craft Your Halloween Cookie Bars

Creating these festive Halloween Cookie Bars is a fun and surprisingly straightforward process. Follow these detailed instructions carefully to bake a spectacular array of treats that will impress everyone at your Halloween celebration!

• 1. Prepare Your Oven and Pan: Begin by preheating your oven to 350°F (175°C). Next, lightly and generously spray a 17″ x 12″ rimmed sheet pan with non-stick cooking spray, ensuring every corner and side is thoroughly coated. This critical step prevents sticking and ensures easy removal. Set this prepared pan aside.
• 2. Cream Butter and Sugars: In the large bowl of your electric mixer, fitted with the paddle attachment, combine the softened unsalted butter with both the granulated sugar and light brown sugar. Beat these ingredients together on medium speed until they are light, fluffy, and appear well combined – this typically takes about 2-3 minutes. This essential creaming process incorporates air into the mixture, which contributes significantly to the bars’ tender and chewy texture.
• 3. Incorporate Eggs and Vanilla: Add the large eggs one at a time, beating well after each individual addition until each egg is fully incorporated into the mixture. Follow this by adding the pure vanilla extract, mixing until just combined. Remember to scrape down the sides of the bowl as needed during this process to ensure all ingredients are thoroughly mixed and no unmixed pockets remain.
• 4. Add Dry Ingredients: Reduce your mixer speed to low. Gradually add the all-purpose flour, baking soda, and kosher salt to the wet ingredients. Mix until just combined, being careful not to overmix the dough. Overmixing can develop the gluten too much, which can unfortunately result in tougher, less tender cookie bars. Stop mixing as soon as no dry streaks of flour remain visible in the dough.
• 5. Divide the Dough: Carefully and evenly divide the prepared base cookie dough into six equal portions. Each portion should be approximately 3/4 cup. Place each of these portions into a separate small mixing bowl. This is the exciting stage where the magic of customization truly begins for each unique flavor!
• 6. Flavor Each Dough Portion: Now it’s time to infuse each dough portion with its unique Halloween mix-ins. Stir gently with a spoon or spatula to combine thoroughly:
  • Monster Mash M&M’s Bars: Stir in 1/4 cup semi-sweet chocolate baking chips and 1/4 cup vibrant Halloween-colored M&M’s.
  • Scary S’mores Bars: Stir in 1/4 cup graham cracker crumbs, 1/4 cup Hershey’s chocolate bar chunks, and 1/4 cup fluffy mini marshmallows.
  • Cookies & Cream “Graveyard” Bars: Stir in 3 chopped Halloween Oreos.
  • Witch’s Brew Peanut Butter Bars: First, thoroughly stir in 1/4 cup creamy peanut butter until it’s completely smooth and evenly distributed throughout the dough. Then, gently fold in 1/4 cup Reese’s Pieces candies and 1/4 cup broken pretzel sticks.
  • Candy Corn Blondie Bars: Stir in 1/4 cup sweet white chocolate chips and 1/4 cup classic candy corn.
  • Nutella Spiderweb Bars: Stir in 1/4 cup Nutella chocolate hazelnut spread until it’s well combined and the cookie dough achieves a rich, dark, uniform color.
• 7. Arrange Dough in Pan: Take each ball of flavored cookie dough and carefully place it into one-sixth of the prepared sheet pan. Arrange them strategically so that each flavor has its own distinct section, creating a colorful and varied mosaic of treats.

• 8. Press Dough Evenly: Using your clean hands (lightly floured if the dough is sticky to prevent sticking), gently and evenly press each section of cookie dough to fill its designated sixth of the sheet pan. Ensure that each cookie dough section is pressed firmly against its neighbors, creating a continuous and seamless layer across the entire pan. This helps prevent gaps between flavors and ensures even baking and easy cutting later.
• 9. Pre-Bake Garnishing: Some of your cookie bars get a delightful head start on their festive appearance before they even hit the oven. Apply garnishes as follows:
  • Monster Mash M&M’s Bars: Liberally garnish this section with additional Halloween-colored M&M’s and a sprinkle of festive Halloween-themed sprinkles for extra visual appeal.
  • Scary S’mores Bars: Press more fluffy mini marshmallows onto the surface of this dough section. They will toast slightly during baking, adding to the s’mores experience.
  • Cookies & Cream “Graveyard” Bars: No pre-bake garnish is needed for this spooky section; its final touches come after baking.
  • Witch’s Brew Peanut Butter Bars: Sprinkle extra Reese’s Pieces candies on top for an extra burst of flavor, color, and texture.
  • Candy Corn Blondie Bars: No pre-bake garnish needed for these; their signature candy corn goes on warm.
  • Nutella Spiderweb Bars: No pre-bake garnish is required for this elegant section.
• 10. Bake to Perfection: Carefully place the sheet pan into your preheated oven and bake for approximately 15-20 minutes. The cookie bars are perfectly ready when the edges appear golden brown and a toothpick inserted into the center of any cookie bar section comes out with moist crumbs attached (it should not be wet batter). Be mindful not to overbake them, as this can result in dry or crumbly bars; we’re aiming for that perfectly soft and chewy texture!
• 11. Post-Bake Finishing Touches: Once the cookie bars are baked, carefully remove them from the oven. Allow them to cool in the pan for a few minutes before adding the final magical and decorative touches:
  • Candy Corn Blondie Bars: While these bars are still warm from the oven, gently press whole candy corns into the top surface of the blondie bars for a classic and vibrant finish.
  • Scary S’mores Bars: While the marshmallows are still slightly warm and pliable, carefully press the candy eyeballs into them so they adhere securely. As the marshmallows cool, the eyeballs will be firmly in place, adding that creepy-cute factor.
  • Cookies & Cream “Graveyard” Bars: Once cooled slightly, generously sprinkle the Oreo cookie bars section with crushed Oreos to create a realistic and eerie “dirt” effect. Then, artfully arrange your sour bright green and orange gummy worms on top of the Oreo “dirt,” as if they’re crawling out of the grave.
  • Nutella Spiderweb Bars: Allow these bars to cool for at least 10 minutes to prevent the icing from melting or spreading too much. Then, using white cookie icing, pipe a delicate and intricate spiderweb design onto the smooth Nutella section. For the pièce de résistance, create a mini spider: take an Oreo, place it in the center of the web, and use halved pretzel sticks as its eight tiny, edible legs.
• 12. Cool Completely and Serve: For the cleanest cuts and best overall texture, allow the entire sheet of cookie bars to cool completely in the pan before attempting to slice them into individual squares. This patience will be rewarded with perfectly formed, delicious bars. Once fully cooled, cut into individual squares, serve, and enjoy your spectacular and varied array of Halloween treats!

Storage and Freezing Tips for Maximum Freshness

Proper storage is absolutely key to enjoying your delicious Halloween Cookie Bars for days to come, ensuring they maintain their delightful taste and texture. Here’s how to keep them fresh and ready for snacking:

For short-term storage, keep your cookie bars in an air-tight container at room temperature for 4-5 days. For optimal freshness and to prevent them from sticking together, which can happen with soft bars, it’s a great practice to place a layer of parchment paper between each stack of bars within the container. This simple step keeps them looking pristine and tasting great.

For longer storage, these versatile cookie bars freeze beautifully, allowing you to enjoy a taste of Halloween treats long after the holiday. Once they have cooled completely to room temperature, which is crucial to prevent ice crystals, wrap each individual cookie bar tightly in plastic wrap. Then, place the wrapped bars into a larger freezer-safe container or separate them into individual freezer-safe baggies. They can be stored in the freezer for up to 2-3 months without losing their quality.

To defrost, simply remove the desired number of frozen cookie bars and let them sit at room temperature, uncovered. Allowing them to thaw uncovered helps prevent excess moisture from accumulating on the surface, which could make them soggy, thus ensuring they retain their perfect texture. They will be ready to enjoy in just a few hours.

I truly hope you enjoy crafting and sharing these delightful and incredibly easy Halloween Cookie Bars! If you whip up a batch (or several!), please make sure to snap a picture and share it with me on Instagram @thebakermama – I absolutely love seeing your creative takes and festive results on my recipes. For even more baking inspiration, tips, and a friendly community, be sure to join my Friends of The BakerMama Facebook group to connect with other baking enthusiasts and share all the fun and yummy recipes you create. Your enthusiasm and creativity are always a huge source of inspiration for me, and I cherish seeing how you bring my ideas to life. Happy baking, and have a wonderfully spooky and delicious Halloween!

xoxo,

Print Recipe

Halloween Cookie Bars

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• Author: The BakerMama
• Prep Time: 20 minutes
• Cook Time: 20 minutes
• Total Time: 40 minutes
• Yield: 36 cookie bars

Print Recipe

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Description

Make 6 different Halloween-themed cookies with one batch of dough! These festive Halloween Cookie Bars bake up in one sheet pan for cookies so delicious and easy, it’s almost scary.

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Ingredients

Cookie Dough Ingredients:

• 1 and 1/2 cups (3 sticks) unsalted butter, softened
• 1 cup granulated sugar
• 1 cup light brown sugar
• 2 large eggs
• 1 teaspoon pure vanilla extract
• 3 cups all-purpose flour
• 1 teaspoon baking soda
• 1/2 teaspoon salt

Mix-In Ingredients:

• Monster Mash M&M’s Bars
  • 1/4 cup semi-sweet chocolate baking chips
  • 1/4 cup Halloween-themed M&M’s, plus extra on top
  • Halloween-themed sprinkles, for garnishing
• Scary S’mores Bars
  • 1/4 cup graham cracker crumbs
  • 1/4 cup Hershey’s chocolate bar chunks
  • 1/4 cup mini marshmallows, plus extra on top
  • Candy eyeballs, for garnishing
• Cookies & Cream “Graveyard” Bars
  • 3 Halloween Oreos, chopped
  • 2 Oreos, crushed, for garnishing
  • 6 sour bright green & orange gummy worms, for garnishing
• Witch’s Brew Peanut Butter Bars
  • 1/4 cup creamy peanut butter
  • 1/4 cup Reese’s Pieces candies, plus more for garnishing
  • 1/4 cup broken pretzel sticks
• Candy Corn Blondie Bars
  • 1/4 cup white chocolate chips
  • 1/4 cup candy corn, plus more for garnishing
• Nutella Spiderweb Bars
  • 1/4 cup Nutella chocolate hazelnut spread
  • White cookie icing, for garnishing
  • 1 Oreo cookie, for making the spider
  • 4 pretzel sticks, halved, for making the spider

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Instructions

1. Preheat oven to 350°F. Spray a 13″ x 18″ rimmed sheet pan with non-stick cooking spray. Set aside.
2. In the bowl of an electric mixer fitted with the paddle attachment, beat the butter and sugars until well combined. Beat in the eggs and vanilla.
3. With the mixer on low speed, beat in the flour, baking soda and salt until combined.
4. Divide cookie dough into 6 different mixing bowls (about 3/4 cup per bowl). Mix each cookie dough flavor as follows:
   • Monster Mash M&M’s Bars: stir in 1/4 cup semi-sweet chocolate baking chips and 1/4 cup Halloween-colored M&M’s
   • Scary S’mores Bars: stir in 1/4 cup graham cracker crumbs, 1/4 cup Hershey’s chocolate barchunks, and 1/4 cup mini marshmallows
   • Cookies & Cream “Graveyard” Bars: stir in 3 chopped Halloween Oreos
   • Witch’s Brew Peanut Butter Bars: stir in 1/4 cup creamy peanut butter until well combined and then fold in 1/4 cup Reese’s Pieces candies and 1/4 cup broken pretzel sticks
   • Candy Corn Blondie Bars: stir in 1/4 cup white chocolate chips and 1/4 cup candy corn
   • Nutella Spiderweb Bars: stir in 1/4 cup Nutella chocolate hazelnut spread until well combined and the cookie dough is dark
5. Place each ball of mixed cookie dough into a sixth of the prepared sheet pan.
6. Press the cookie doughs down evenly, with your hands, to fill the sixth of the sheet pan that each cookie dough is in. Each cookie dough should be pressed up next to the other cookie doughs that are beside it to fill the entire sheet pan.
7. Garnish each square of cookie dough as follows:
   • Monster Mash M&M’s Bars: garnish with more Halloween-colored M&M’s and Halloween-themed sprinkles
   • Scary S’mores Bars: garnish with more mini marshmallows
   • Cookies & Cream “Graveyard” Bars: no garnish before baking
   • Witch’s Brew Peanut Butter Bars: garnish with more Reese’s Pieces candies
   • Candy Corn Blondie Bars: no garnish before baking
   • Nutella Spiderweb Bars: no garnish before baking
8. Bake for about 15-20 minutes or until golden brown on top and a toothpick inserted in the center of the cookie bars comes out with moist crumbs. Try not to over-bake them if you want them to be chewy.
9. Once the cookie bars are baked, let cool for a few minutes and then finish them off as follows:
   • Candy Corn Blondie Bars: press whole candy corns into the top of the warm blondie bars
   • Scary S’mores Bars: press the candy eyeballs into the melted marshmallows so they stick
   • Cookies & Cream “Graveyard” Bars: sprinkle the Oreo cookie bars section with crushed Oreos and then arrange the gummy worms on top of the Oreo “dirt”
   • Nutella Spiderweb Bars: let the bars cool for at least 10 minutes and then pipe a spiderweb design onto the Nutella bars section. Create a mini spider with the Oreo and halved pretzel sticks and place it on the spiderweb
10. Let the cookie bars cool completely in the pan before cutting into squares and serving. Enjoy!

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