5 from 2 votes
Monster cookies with m&m's on a wire cooling rack.
Thick and Chewy Monster Cookies
Prep Time
15 mins
Cook Time
10 mins
Total Time
25 mins

Thick and chewy Monster Cookies made with oats, peanut butter, M&M candies and chocolate chips. These are always a huge hit with family and friends.

Course: Dessert
Cuisine: American
Servings: 24
Calories: 191 kcal
Author: Lauren Allen
  • 1/2 cup butter
  • 1/2 cup granulated sugar
  • 1/2 cup light brown sugar
  • 1/2 cup peanut butter
  • 1 egg
  • 1 teaspoon vanilla extract
  • 1 cup all-purpose flour
  • 1 1/4 cups old-fashioned rolled oats
  • 1/4 teaspoon salt
  • 1/2 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 3/4 cup M&M candies
  • 1/2 cup semi-sweet chocolate chips
  1. Preheat oven to 350 degrees F.

  2. Cream the butter and sugar together really well—at least 2-3 minutes until light and fluffy.

  3. Add peanut butter and mix well. Add egg and vanilla and mix.

  4. In a separate mixing bowl stir together the flour, oats, salt, baking powder and baking soda.  (Be extra careful not to add too much flour).

  5. Add to the wet mixture and mix to combine. Stir in chocolate chips and M&M’s.

  6. Bake at 350 degrees for 10-12 minutes, or a little longer if you make them bigger than a 1 inch cookie scoop. Don't over bake--they will look just set. 

  7. Remove them from the oven and allow them to cool completely on the pan.

Recipe Notes

Adapted from our Mrs. Fields chocolate chip cookie recipe.

Nutrition Facts
Thick and Chewy Monster Cookies
Amount Per Serving
Calories 191 Calories from Fat 81
% Daily Value*
Total Fat 9g 14%
Saturated Fat 4g 20%
Cholesterol 18mg 6%
Sodium 114mg 5%
Potassium 94mg 3%
Total Carbohydrates 23g 8%
Dietary Fiber 1g 4%
Sugars 14g
Protein 3g 6%
Vitamin A 2.9%
Calcium 2.5%
Iron 5%
* Percent Daily Values are based on a 2000 calorie diet.