Monster Cookies

4.5 from 2 votes
Prep Time 15 minutes
Cook Time 12 minutes
Total Time 27 minutes
Author Lauren Allen
Servings 24
Print Review

These peanut butter Monster Cookies are slightly crisp on the outside, and soft and chewy in the center. They are loaded with oats, peanut butter, M&M candies and chocolate chips and they’re completely addicting!


  • ½ cup butter
  • ½ cup granulated sugar
  • ½ cup light brown sugar
  • ½ cup peanut butter
  • 1 egg
  • 1 teaspoon vanilla extract
  • 1 cup all-purpose flour
  • cups old-fashioned rolled oats
  • ¼ teaspoon salt
  • ½ teaspoon baking powder
  • ½ teaspoon baking soda
  • ¾ cup M&M candies
  • ½ cup semi-sweet chocolate chips


  1. Preheat oven to 350 degrees F.
  2. Cream the butter and sugar together really well, until light and fluffy.
  3. Add peanut butter and mix well. Add egg and vanilla and mix.
  4. In a separate mixing bowl stir together the flour, oats, salt, baking powder and baking soda.
  5. Add to the wet mixture and mix to combine. Stir in chocolate chips and M&M’s.
  6. Bake at 350 degrees for 10-12 minutes, or a little longer if you make them bigger than a 1 inch cookie scoop. Don't over bake--they will look just set.
  7. Remove them from the oven and allow them to cool on the pan for 10 minutes before removing to a wire cooling rack.

Recipe Notes

Adapted from my Mrs. Fields Oatmeal Chocolate Chip Cookies