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M&M Cookie Bars cut into squares on a cutting board from overhead

M&M Cookie Bars

  • Author: Shelly
  • Prep Time: 10 minutes
  • Cook Time: 25 minutes
  • Total Time: 35 minutes
  • Yield: 30 bars 1x
  • Category: Cookies
  • Method: Oven
  • Cuisine: Dessert


M&M Cookie Bars are soft and buttery, loaded with M&M candies and chocolate chips. Perfect for parties, the holidays, or a lunch box treat!


  • 1 cup butter, room temperature
  • 1 cup granulated sugar
  • 1 cup light brown sugar
  • 3 large eggs
  • 2 teaspoons pure vanilla extract
  • 1 teaspoon kosher salt
  • 1/2 teaspoon baking powder
  • 1 teaspoon cornstarch
  • 2 1/2 cups all-purpose unbleached flour
  • 1 1/4 cups Mini M&Ms (*see note)
  • 1 cup semi-sweet chocolate chips
  • Optional – 1/4 cup M&Ms and 2 tablespoons chocolate chips to press on top before baking.


  1. Preheat the oven to 350°F. Line a 9×13 baking pan with parchment paper. Coat with nonstick spray and set aside.
  2. In the bowl of your stand mixer fitted with the paddle attachment, mix the butter, granulated sugar, and brown sugar together on medium speed for 2 minutes.
  3. Add in the eggs, vanilla, salt, baking powder, and cornstarch and mix until combined, scraping the sides of the bowl as necessary. 
  4. Turn the mixer to low and add in the flour, mixing until incorporated. 
  5. Stir in the M&Ms and chocolate chips until combined. 
  6. Spread the cookie dough into the prepared pan, if desired press additional M&Ms and chocolate chips into the top of the dough, and bake for 25 – 30 minutes until the edges are golden and the center is almost set. 
  7. Allow to cool in the pan completely before cutting into bars.


*I like to use a combo of regular size and mini M&Ms because I like the look of both sizes in the finished product. This is not necessary, you can use all minis or all regular.

Store airtight at room temperature for up to 3 days

Freeze airtight for up to 30 days.

Keywords: cookies and cups, christmas cookies, cookie bar, cookie recipe, mm cookies

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