Halloween M&M Cookie Bars

5 from 4 votes

These Halloween M&M cookie bars make a deliciously festive treat with the addition of Halloween M&Ms and Halloween sprinkles mixed into a delicious traditional cookie base.

Prep Time10

Cook Time27

cooling time1

Total Time1 37

Course: Dessert

Cuisine: American

Servings: bars

Calories: 250kcal

Author: Britni Vigil

Ingredients

2 ¼ cups all-purpose flour
1 tsp salt
½ tsp baking soda
¾ cup unsalted butter softened
1 cup granulated sugar
½ cup light brown sugar packed
2 large eggs
1 tsp pure vanilla extract
1 ¼ cup Cookies & Cream M&Ms
1 ½ cups Oreos chopped and divided
Halloween sprinkles

Instructions

Start by preheating your oven to 350 degrees and lining a 9×13 baking dish with parchment paper.
Whisk dry ingredients – flour, salt, and baking soda – together in a bowl then set that bowl aside.
2 1/4 cups all-purpose flour, 1/2 tsp baking soda, 1 tsp salt
In the bowl for a stand mixer, cream the butter and sugars together until well combined.
3/4 cup unsalted butter, 1 cup granulated sugar, 1/2 cup light brown sugar
Add the eggs and vanilla then beat well, scraping down the sides of the bowl with a spatula if necessary.
2 large eggs, 1 tsp pure vanilla extract
Slowly add in the flour mixture and mix until just combined; don’t over mix.
Finish the dough by folding in one cup of the M&Ms and one of the chopped Oreos.
1 1/4 cup Cookies & Cream M&Ms, 1 1/2 cups Oreos
Spread the cookie dough batter evenly into the prepared pan and top evenly with the remaining M&Ms, Oreo pieces, and sprinkles.
Halloween sprinkles
Bake in the preheated oven for 24-27 minutes, beginning to check around 20 minutes and remove when the bars are cooked.

Notes

Make sure to bake these in a 9×13 baking pan. They’re too thick to cook in a smaller pan and won’t bake properly without being able to spread out and expand.

Store leftover bars (if there are any) in an airtight container for up to three days.

Ingredient Notes:

M&Ms – this recipe uses the Halloween Cookies and Cream M&Ms but it would be fine with traditional M&Ms as well, just try to find the Halloween colored ones!
Oreos – I used regular Oreos in this recipe but Double Stuffed would work fine as well. You want your Oreos to be chopped into bite-sized chunks. One cup of the Oreos will go into the cookie dough and the rest will be added on top of the M&M cookie bars.
Sprinkles – any kind of Halloween sprinkles can be used, I just used what I had on hand!

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