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Monster Cookie Bars


Add a little bit of peanut butter deliciousness to these delicious monster cookies by doing half and half servings of M&Ms and Reese's Pieces!

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Rate this recipe 4.1/5 (32 Votes)


  • 1 stick butter
  • 1 cup white sugar
  • 1 cup brown sugar
  • 1 1/2 cups creamy peanut butter
  • 3 eggs
  • 2 teaspoons baking soda
  • 4 1/2 cups quick cooking oatmeal
  • 1 (12-ounce) package chocolate chips
  • 1 (12-ounce) package milk chocolate M&M's


Servings 10
Preparation time 10mins
Cooking time 25mins
Adapted from


Step 1

Combine the butter and sugars. Blend well. Blend in eggs and baking soda. Add peanut butter in mix and blend until smooth.

Adding a cup at a time, start mixing in the oatmeal by hand. Slowly fold in the M&M’s and chocolate chips

Spread in a well greased 9x13-inch pan for 15 to 20 minutes at 350°F. Be careful to not overbake as these taste better just a little on the soft side.

Store in an airtight container.

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