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Monster Cookie Bars Recipe

When a big ‘ol batch of Monster Cookies is just too much work. Monster Cookie Bars. Just one bowl & one deep cookie sheet required. No flour recipe.

Prep Time 20 minutes
Cook Time 20 minutes


  • 2 cups light brown sugar
  • 1 1/2 cups white sugar
  • 3/4 cup butter, softened
  • 1 1/2 teaspoon baking soda
  • 3 eggs
  • 1 teaspoon vanilla
  • 2 cups creamy peanut butter
  • 6 cups old fashioned oats
  • 1 cup semi sweet chocolate chips
  • 1/2 cup M&Ms candies
  • 1/2 cup Reese's Pieces


  1. Preheat oven to 350 degrees.  Prepare a large baking (cookie) sheet with parchment paper.

  2. Beat Sugars, Butter & Baking Soda in a large mixing bowl until well blended.  Add Eggs and Vanilla and mix until creamy.   Continue to use electric mixer and add Peanut Butter.  Once the mixture is well blended, use a wooden spoon to mix in Oats, Chocolate Chips, M&Ms and Reese’s Pieces.

  3. Press dough into pan and bake 20-22 minutes.  Allow cool time before cutting into bars.  Enjoy!