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monster cookies stacked
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4.96 from 22 votes

Monster Cookies

These monster cookies are unique, because they're made without flour - only oats, so they're ultra chewy and hearty! They're also loaded with creamy peanut butter, M&Ms, and chocolate chips.
Prep Time15 mins
Cook Time12 mins
Total Time27 mins
Course: Dessert
Cuisine: American
Keyword: baked, m&ms, sweet
Servings: 36 cookies
Calories: 253kcal


  • 1/2 cup unsalted butter softened to room temperature
  • 1 1/4  cups dark brown sugar packed
  • cup granulated sugar
  • large eggs room temperature
  • 1 tablespoon vanilla extract
  • 1 1/2  cups creamy peanut butter
  • 4 1/2  cups old fashioned oats* certified gluten free if necessary
  • teaspoons  baking soda
  • 1/2  teaspoon salt
  • cup M&M's
  • cup semi-sweet chocolate chips


  • Place butter, sugars, eggs, vanilla, and peanut butter in a large bowl.
  • Using a hand mixer or stand mixer, beat together until well combined. 

  • Add in oats, baking soda, salt, M&Ms, and chocolate chips.
  • Mix until well combined.
  • Optional: chill the dough for at least 30 minutes. I never do this, but if you're worried about spreading, I'd recommend chilling the dough. 

  • Preheat oven to 350 degrees F and line a rimmed baking sheet with a silicone baking mat. 

  • Use a cookie scoop** to scoop cookie onto prepared baking sheet. I bake 12 at a time.

  • Depending on the size of your cookie scoop, bake cookies for 8-12 minutes (8 for smaller cookies, 12 for larger cookies).
  • Remove from oven and let cool for a few minutes, before removing them from the cookie sheet and placing the cookies on a cooling rack.
  • Serve immediately or cool completely before storing in airtight containers!
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*I've had success with quick cooking oats and rolled oats, although the results are different. Quick cooking oats aren't quite as thick, fluffy, and sturdy as the rolled oats.
**If you use a smaller cookie scoop, you'll get about 4 dozen cookies and the calorie count will be smaller.


Serving: 1cookie | Calories: 253kcal | Carbohydrates: 31g | Protein: 5g | Fat: 12g | Saturated Fat: 5g | Cholesterol: 25mg | Sodium: 161mg | Potassium: 119mg | Fiber: 3g | Sugar: 22g | Vitamin A: 45IU | Calcium: 25mg | Iron: 0.8mg