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Monster Cookies are filled with peanut butter, chocolate chips, oatmeal and M&Ms. This recipe yields cookies that are soft, chewy, full of texture and completely ginormous.

Soft and Chewy Monster Cookies

These ginormous Soft and Chewy Monster Cookies are filled with peanut butter, chocolate chips, oatmeal AND M&Ms. Packed with flavor and delicious chewy texture
Course Dessert
Cuisine American
Keyword Cookies, Monster Cookies
Prep Time 10 minutes
Cook Time 12 minutes
Total Time 30 minutes
Servings 18 Cookies
Calories 260kcal


  • ½ cup unsalted butter softened
  • ½ cup brown sugar
  • ¼ cup white sugar
  • ½ cup peanut butter
  • 1 large egg
  • 2 teaspoons vanilla extract
  • ¾ cup all-purpose flour
  • ½ teaspoon baking soda
  • ¼ teaspoon salt
  • 1 cup old-fashioned oats
  • ¾ cup chocolate chips
  • ½ cup M&Ms


  • Preheat the oven to 350F degrees and line 2 cookie sheets with parchment paper or baking mats. 
  • In a large bowl beat the butter, brown sugar and white sugar until fluffy (about 2 minutes). Mix in the peanut butter, followed by the vanilla extract and egg. 
  • Turn the mixer to low speed and beat in the flour, baking soda and salt. 
  • Mix in the oats.
  • Stir in the chocolate chips and M&Ms. 
  • Form the dough into balls about 3 tablespoons in size (I use a cookie scoop to do this), and place 2 inches apart on the lined cookie sheets. Optionally, place a few extra chocolate chips & candies on top of each cookie.
  • Bake one cookie sheet at a time in the preheated oven for 12-14 minutes or until the tops look just set. 
  • Cool on the tray for 5 minutes, then transfer to a wire rack and continue cooling. 


*Store cookies in an airtight container at room temperature for up to 4 days. 


Calories: 260kcal