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the best monster cookies with m and ms

Classic Monster Cookies

I always look forward to enjoying a couple soft and chewy Monster Cookies at Christmas and big family parties!  Flourless Monster Cookies are the BEST when each bite is filled with oatmeal, M&Ms, chocolate chips and peanut butter.
Course Dessert
Cuisine American
Keyword Christmas cookies
Prep Time 20 minutes
Cook Time 8 minutes
Total Time 28 minutes
Servings 45 cookies
Calories 183kcal
Author Jennifer @ Plowing Through Life


  • 1/2 cup butter softened
  • 1 cup sugar
  • 1 cup brown sugar
  • 3 eggs
  • 1 1/2 cups peanut butter
  • 2 tablespoons Karo syrup
  • 1 teaspoon vanilla
  • 2 teaspoon baking soda
  • 5 cups quick oats *to make recipe gluten-free, must purchase gluten-free oats
  • 6 ounces milk chocolate chips 1/2 a bag
  • 6 ounces M&Ms


  • Cream butter, sugar, brown sugar and eggs.
  • Add peanut butter, Karo syrup and vanilla.
  • Mix in baking soda and quick oats.  Make sure soda is mixed evenly throughout the dough.
  • Gently fold in chocolate chips and M&Ms.
  • Drop by tablespoon or cookie scoop onto a baking sheet. Bake at 350ºF for 8 - 10 minutes.


  • Use softened, but not melted butter
  • Use butter not margarine for the best flavor
  • Quick oats or minute oats are a must - using old fashioned oats would totally change the texture and balance of the recipe
  • As tempting as it may be, do NOT add extra M&Ms - the cookies won't stick together and have the right balance if you do
  • Semi-sweet chocolate chips will work fine, our family prefers milk chocolate
  • Purchase gluten-free oats to make this a gluten-free recipe
  • Recipe can be doubled if you have a mixing bowl that can hold all of the ingredients


Calories: 183kcal | Carbohydrates: 23g | Protein: 4g | Fat: 9g | Saturated Fat: 3g | Cholesterol: 17mg | Sodium: 118mg | Potassium: 98mg | Fiber: 2g | Sugar: 16g | Vitamin A: 96IU | Vitamin C: 1mg | Calcium: 23mg | Iron: 1mg