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Monster Peanut Butter Oatmeal Cookies

These Monster Peanut Butter Oatmeal Cookies have it ALL! Each bite is filled with chewy oats, peanut butter, chocolate chips and M&M's! Truly the perfect cookie!
Prep Time10 mins
Cook Time10 mins
Total Time20 mins
Course: Dessert
Cuisine: American
Keyword: monster peanut butter oatmeal cookies, outmeal cookie
Servings: 3 dozen cookies
Calories: 2264kcal
Author: Trish - Mom On Timeout


  • 1/2 cup creamy peanut butter I used Skippy Naturals
  • 1/2 cup unsalted butter softened
  • 1 cup brown sugar
  • 1/2 cup granulated sugar
  • 1 tsp baking soda
  • 1/2 tsp salt
  • 1 tsp ground cinnamon optional
  • 2 eggs room temperature
  • 1 tsp vanilla extract
  • 1 1/2 cups all-purpose flour
  • 3 cups oats quick oats are fine
  • 3/4 cup semi-sweet chocolate chips
  • 3/4 cup peanut butter chocolate chips
  • 3/4 cup mini M&M's


  • Preheat oven to 350F.
  • Line baking sheet with parchment paper or silicone baking mat and set aside.
  • Beat peanut butter and butter together in a large mixing bowl until thoroughly combined.
  • Cream in brown sugar and granulated sugar.
  • Beat in baking soda, salt, and cinnamon.
  • Add eggs one at a time, beating well after each addition.
  • Beat in vanilla extract.
  • Stir in flour and oats until combined.
  • Stir in chocolate chips, peanut butter chips, and M&M's.
  • Scoop out using an ice cream scoop or large cookie dough scoop. You want about 1/4 cup of dough per cookie.
  • Bake for 9-11 mins or until lightly golden brown on top. Let cookies rest for 10 minutes on baking sheet before removing to a wire rack to cool.
  • Store cookies in an airtight container for up to 4 days.


Calories: 2264kcal | Carbohydrates: 299g | Protein: 46g | Fat: 103g | Saturated Fat: 53g | Cholesterol: 209mg | Sodium: 1203mg | Potassium: 1032mg | Fiber: 20g | Sugar: 176g | Vitamin A: 1243IU | Vitamin C: 1mg | Calcium: 253mg | Iron: 13mg