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Halloween M&M Cookie Bars

These delicious Halloween M&M cookie bars combine a traditional cookie base with Oreos, M&Ms, and festive sprinkles for a yummy, colorful treat perfect for parties or any time you need a fun dessert.
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Prep Time 10 minutes
Cook Time 27 minutes
Total Time 37 minutes
Servings: 24
Cuisine: Chinese
Calories: 120
Ingredients Method Notes

Ingredients
  

Cookie Bar Ingredients
  • 2.25 cups all-purpose flour
  • 1 tsp salt
  • 0.5 tsp baking soda
  • 0.75 cup unsalted butter softened
  • 1 cup granulated sugar
  • 0.5 cup light brown sugar packed
  • 2 large eggs
  • 1 tsp pure vanilla extract
  • 1.25 cups Cookies & Cream M&Ms
  • 1.5 cups Oreos chopped and divided
  • as needed Halloween sprinkles

Method
 

Preparation Steps
  1. Start by preheating your oven to 350 degrees F (175 degrees C) and lining a 9x13 inch baking dish with parchment paper.
  2. Whisk the dry ingredients—flour, salt, and baking soda—together in a bowl, then set that bowl aside.
  3. In the bowl of a stand mixer, cream the butter and sugars together until well combined and fluffy.
  4. Add the eggs and vanilla, then beat well, scraping down the sides of the bowl with a spatula if necessary, until fully incorporated.
  5. Slowly add in the flour mixture and mix until just combined; be careful not to over mix the dough.
  6. Finish the dough by gently folding in one cup of the M&Ms and one cup of the chopped Oreos.
  7. Spread the cookie dough batter evenly into the prepared pan. Top evenly with the remaining M&Ms, Oreo pieces, and Halloween sprinkles.
  8. Bake in the preheated oven for 24-27 minutes, beginning to check around 20 minutes. Remove when the bars are golden brown and set.

Notes

These M&M cookie bars are best served warm or at room temperature. I do not recommend freezing these cookie bars due to the amount of candy and cookies; they tend not to thaw as well as other cookie recipes.