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Horizontal oblique overhead image of three rows of oatmeal chocolate chip M&M cookies cooling on a black wire rack, on a brown wood surface with a glass bottle of milk.

Chewy Flourless Monster Cookies

  • Author: Shanna Mallon
  • Total Time: 30 minutes
  • Yield: 32 cookies 1x


Chewy and chocolatey, these flourless monster cookies have all the best parts of your favorite sweet treat wrapped into one monster-size package.


  • ½ cup unsalted butter, softened
  • 1 ½ cups natural creamy peanut butter
  • 1 ½ cups packed dark brown sugar
  • ¼ cup coconut sugar or granulated sugar
  • 4½ cups rolled oats (gluten free)
  • 1 teaspoon cinnamon
  • 2 teaspoons baking soda
  • 3 large eggs
  • 1½ teaspoons vanilla extract
  • 1 teaspoon salt
  • ½ cup candy-coated chocolate pieces, like M&M’s, or your choice of chopped nuts
  • ½ cup dark chocolate chips
  • ½ cup unsweetened coconut flakes


  1. Preheat oven to 350°F and line a large baking sheet with parchment paper. Measure out all of your ingredients.
  2. In the bowl of a stand mixer, beat butter, peanut butter, brown sugar, and granulated sugar on medium-high speed until creamy, about 2 minutes.
  3. Slowly add the eggs, one at a time, and the vanilla extract, and mix until well-combined.
  4. Add the oats, baking soda, and salt, and mix until fully combined.
  5. Stir in the M&M’s, chocolate chips, and coconut flakes.
  6. Using a tablespoon or a cookie scoop (link to ice cream scoop review), scoop 3 tablespoons of batter and form into a ball. Place on baking sheet. Repeat with remaining batter, leaving a few inches between each dough ball.
  7. Bake for 12-15 minutes or until edges are slightly browned.
  8. Remove from the oven and let cool on the baking sheet for 5 minutes. Transfer to a cooling rack to cool completely.
  • Prep Time: 15 minutes
  • Cook Time: 15 minutes
  • Category: Cookies
  • Method: Baking
  • Cuisine: Dessert

Keywords: M&M's, cookies, oatmeal cookies, gluten-free, gluten-free dessert, flourless