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AMAZING Chocolate Chip M&M Cookie Bars
4.6 from 15 votes

Chocolate Chip M&M Cookie Bars

Need an easy dessert recipe to serve a crowd? These Chocolate Chip M&M Cookie Bars are perfect for any party! Just mix, bake, slice and done!


  • 1 cup unsalted butter melted
  • 1 cup brown sugar packed
  • 3/4 cup sugar
  • 2 large eggs room temperature
  • 1 egg yolk room temperature
  • 2 teaspoons vanilla extract
  • 2 2/3 cups flour
  • 2 teaspoons cornstarch
  • 1/2 teaspoon baking powder
  • 1 teaspoon salt
  • 1 1/4 cups chocolate chips
  • 1 1/4 cup M&M's


  1. Preheat oven to 350 degrees and prepare a 9X13 pan by lightly greasing it or lining it with parchment paper.  

  2. In a large bowl, combine butter (make sure it's not super hot or it will cook the eggs), brown sugar and sugar.  Then add eggs, egg yolk and vanilla extract.

  3. In a separate bowl whisk together flour, cornstarch, baking powder and salt.  

  4. Add the dry ingredients to the wet and just before it's all combined add in your chocolate chips and M&M's.  Stir and then dump into your prepared pan and spread out evenly.

  5. Bake for 25-30 minutes or until the edges start to turn golden brown.  Let cool for 5-10 minutes and then serve warm or completely cooled.