M&M Cookie Bars Recipe

If you’re looking for an easy dessert that’s perfect for holidays, parties, or family gatherings, these M&M cookie bars are a wonderful choice. Made with simple pantry ingredients and topped with colorful M&M’s, they can be customized for any season or celebration. Use red and pink candies for Valentine’s Day, red, white, and blue for the Fourth of July, or your favorite colors for birthdays and special occasions.

The texture of these cookie bars is rich and buttery, with crisp edges and a soft center. They’re simple to make in a square baking pan, and there’s no need to chill the dough. Whether you’re serving them for a holiday dessert table or packing them for a potluck, these M&M cookie bars are always a crowd-pleaser.

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Why This M&M Cookie Bars Recipe Works

These M&M cookie bars are rich, buttery, and easy to make with simple pantry ingredients. The combination of powdered sugar and granulated sugar creates a texture that’s somewhere between a classic cookie and shortbread, resulting in bars that are thick, tender, and just slightly crumbly. Another reason to love this recipe is its versatility. Simply change the color of the M&M’s to match any season or celebration, making one easy dessert suitable for holidays, birthdays, parties, and family gatherings all year long.

M&M Cookie Bars Ingredients

• Butter. Provides rich flavor and gives the bars their tender, melt-in-your-mouth texture.
• Powdered Sugar. Adds a delicate sweetness and contributes to the shortbread-like texture.
• Granulated Sugar. Balances the sweetness and helps create lightly crisp edges.
• Eggs. Add structure and help bind the ingredients together.
• Vanilla Extract. Adds warm, classic cookie flavor.
• All-Purpose Flour. Forms the base of the dough and provides structure.
• Baking Powder. Gives the bars a little lift and helps keep them from becoming too dense.
• Baking Soda. Works with the other ingredients to create a tender texture.
• Cream of Tartar. Adds a subtle tang and contributes to the soft texture.
• Salt. Balances the sweetness and enhances the buttery flavor.
• M&M’s. Add color, crunch, and a festive touch that can be customized for any occasion.

How to Make M&M Cookie Bars

• Preheat oven to 350 degrees F.
• Lightly spray a 9 x 9-inch baking pan with Baker’s Joy or non-stick spray. Set aside.
• In the bowl of a stand mixer, or a large mixing bowl, combine the butter, powdered sugar, granulated sugar, eggs, and vanilla.
• Beat on medium high for 1 minute. (An electric mixer works best.)
• In a separate bowl, whisk together the all purpose flour, baking powder, baking soda, cream of tartar and salt.
• Add the flour mixture to the sugar/egg mixture in 2 increments, mixing well and scraping the bowl between additions.
• Put cookie dough into the prepared pan and spread into an even layer.
• Top the dough with a generous amount of M&M’s.
• Bake for 25-30 minutes. Cookie cake is done when the top is slightly golden, and the edges are pulling away from the pan.
• May be served warm or at room temperature.

Holiday Variations For M&M Cookie Bars

One of the best things about these M&M cookie bars is how easy they are to customize for different holidays and celebrations. Simply swap the colors of the M&M’s to match the occasion. Use red, white, and blue candies for Memorial Day, the Fourth of July, or Labor Day. For Valentine’s Day, choose red, pink, and white M&M’s and bake the dough in a decorative baking dish or heart-shaped pan. Pastel candies are perfect for Easter, while red and green M&M’s turn these bars into a festive Christmas dessert. The buttery cookie base stays the same, making this one recipe that can be enjoyed all year long.

For the Valentine’s Day version shown here, I baked the dough in a heart-shaped baking dish and used red, pink, and white M&M’s. The baking time may need to be adjusted slightly depending on the depth and size of your baking dish.

Tips For the Best M&M Cookie Bars

• Use very soft butter for easy mixing. Don’t overbake.
• The bars are done when the edges are lightly golden.
• Let the bars cool completely before cutting for the cleanest squares.

These M&M cookie bars are a simple dessert that’s easy to adapt for any season, holiday, or family gathering. With their buttery texture, colorful candy topping, and straightforward ingredients, they’re a recipe you’ll find yourself making again and again. If you enjoy easy dessert bars, you might also like my small batch chocolate chip cookie bars, classic snickerdoodle bars, strawberry bars, or cake mix cookie bars. No matter which version you choose, dessert doesn’t get much easier than a pan of homemade cookie bars.

Shop & Source

• mini wood board
• KitchenAid Mixer
• 9 x 9-inch baking dish
• heart shaped baking dish
• OXO bench scraper
• round wood board