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5 from 3 votes

Flourless Jumbo Peanut Butter Monster Cookies

Flourless, delicious, chewy peanut butter oatmeal monster cookie made a little healthier! You would never know there wasn't flour in these monsters!
Course: Dessert
Cuisine: American
Keyword: chocolate chip cookies, classic cookies, cookies, gluten free, healthy, M&Ms, oatmeal, oats, peanut butter
Servings: 12 Monster Cookie Servings
Author: Kim Lange


  • 3/4 cup creamy or crunchy peanut butter
  • 1/4 cup butter or 1/4 cup applesauce, softened
  • 2/3 cup packed brown sugar
  • 2 eggs
  • 1 teaspoon vanilla extract
  • 1 & 1/3 cups quick-cooking oats or {GF} quick-cooking oats can also use old-fashioned, or 1/2 & 1/2 quick and old-fashioned oats, depending on texture you like. Add up to 1/4 extra oats for thicker cookies!
  • 1/2 teaspoon baking soda
  • 1/2 tsp baking powder
  • 1 generous pinch of salt
  • 1/2 cup semisweet chocolate chips
  • 1/2 cup M&M's
  • 1/2 cup additional add-ins like nuts, candies, raisins, etc. (I used more M&M's and chocolate chips.


  • Preheat oven to 350°.
  • In a large bowl, cream peanut butter, butter and sugars until well blended and smooth and then beat in eggs and vanilla.
  • Add in the baking soda, baking powder, oats and salt and mix together. Will be on the runny side.
  • Stir in chocolate chips, m&ms and whatever add-ins you want.
  • Use a large cookie - 1/4 cup scoop or drop by heaping tablespoonfuls 6 large cookies per baking sheet lining with parchment paper.
  • Bake 12-14 minutes or until edges are browned. Let sit on baking sheets for 5 minutes before removing. Remove from pans with spatula to wire racks to cool. Store in airtight containers.
  • These freeze well too!


For smaller cookies, reduce time to 8-10 minutes, medium cookies bake 10-12 minutes and large cookies bake 12-14 minutes.