Giant Monster Cookies with M&Ms

Giant Monster Cookies

Course Dessert
Cuisine American
Keyword monster cookies
Prep Time 1 hour 10 minutes
Cook Time 30 minutes
Total Time 1 hour 40 minutes
Servings 9 cookies
Author Amanda Rettke


  • 2 cups (300g) oats, preferably not quick oats
  • 1/4 tsp. baking powder
  • 1 tsp. baking soda
  • 1 cup (128g) all-purpose flour
  • 1/4 tsp. coarse kosher salt
  • 1/2 tsp. ground cinnamon optional
  • 1/2 cup (113g) unsalted butter, softened
  • 1/4 cup (57g) granulated sugar
  • 3/4 cup (150g) brown sugar, packed
  • 1 cup (226g) creamy peanut butter
  • 2 tsp. vanilla extract
  • 2 large eggs, room temperature
  • 1 cup M&Ms, divided (mini M&M's work great as garnish as well)
  • 1/2 cup chocolate chips


Toasting the Oats (Optional)

  1. Preheat oven to 350°F.
  2. Place oats on baking sheet and toast for 12 minutes, rotating pan halfway through. Remove and let cool on cooling rack.

Monster Cookie

  1. Combine oats, baking powder, baking soda, flour, salt, and cinnamon in medium bowl. Set aside.
  2. Combine butter, sugar, brown sugar, and peanut butter in bowl of mixer until fully mixed, about three minutes at medium speed.
  3. Add eggs, one at a time, mixing for 30 seconds after each addition.
  4. Add vanilla extract.
  5. Reduce mixer speed and add oat mixture. Mix just until combined.
  6. Add 1/2 cup M&Ms and 1/2 cup chocolate chips.
  7. Cover bowl with plastic wrap and let rest at room temperature for one hour.
  8. Preheat oven to 350°F.
  9. Use 1/2 cup measuring cup to portion cookies and place on parchment-lined baking sheet. Cover individual cookies with remaining M&M's.
  10. Bake for 16-20 minutes or until edges are slightly golden brown. Remove from oven and let cool.