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m&ms cookie bar on 9x13 pan

M&M Cookie Bars Recipe

  • Author: Lynette
  • Prep Time: 15 minutes
  • Cook Time: 20 minutes
  • Total Time: 35 minutes
  • Yield: 24 1x
  • Category: Cookies
  • Method: Baking
  • Cuisine: American


Chewy chocolate chip M&M cookie bars made in a 9×13 pan!  A one bowl dessert recipe.


  • 1/2 Cup butter, melted
  • 1 1/2 Cups peanut butter
  • 1 Cup sugar
  • 1 1/4 Cup brown sugar
  • 3 Eggs
  • 1 teaspoon light corn syrup
  • 4 Cups old fashioned oats
  • 2 tsp baking soda
  • 1 Cup M&Ms
  • 3/4 Cup chocolate chips


  1. Preheat oven to 350˚ F.
  2. Combine melted butter, peanut butter, sugar, brown sugar, eggs and corn syrup until fully incorporated.  Stir in oatmeal, baking soda, M&Ms and chocolate chips.
  3. Press into an un-greased jelly roll pan.
  4. Bake for 15-20 minutes.
  5. Let cool and cut into squares.


To easily press the cookie bars into the pan, use a large sheet of parchment paper.

Keywords: m&m cookie bars, cookie bars, chocolate chip cookie bars 9x13 pan, no flour monster cookie bars