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Monster Cookies

Monster cookies are thick, chewy peanut butter cookies loaded with M&Ms in every color, plus chocolate chips and visible oats in each bite. This easy no-flour cookie style uses quick-cooking oats for a soft center and golden edges straight from the oven.
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Prep Time 15 minutes
Cook Time 12 minutes
Total Time 27 minutes
Servings: 24 servings
Course: Dessert
Cuisine: American
Calories: 260
Ingredients Equipment Method Notes

Ingredients
  

Monster cookies base
  • 1.5 cup creamy peanut butter Use creamy style for a thick, chewy dough.
  • 1 cup brown sugar Pack into the measuring cup for best chew.
  • 0.5 cup granulated sugar
  • 3 large eggs
  • 2 tsp vanilla extract
  • 1 tsp baking soda
  • 3 cup quick-cooking oats Quick oats help the dough stay thick without flour.
  • 1 cup M&Ms Use red, white, and blue for a patriotic version if you like.
  • 0.5 cup chocolate chips
  • 0.5 cup mini chocolate chips

Equipment

  • 1 sheet pan

Method
 

Prep and preheat
  1. Preheat oven to 350°F and line two baking sheets with parchment paper.
  2. Beat creamy peanut butter, brown sugar, and granulated sugar together in a large bowl until combined.
Mix the dough
  1. Add large eggs, vanilla extract, and baking soda, then mix until smooth.
  2. Stir in quick-cooking oats until fully incorporated.
  3. Fold in M&Ms and both chocolate chips until the dough is evenly loaded.
Scoop and bake
  1. Scoop dough into 2-tablespoon balls and place 2 inches apart on the prepared baking sheets.
  2. Flatten each dough ball slightly with your palm so the cookies bake evenly.
  3. Bake for 10–12 minutes until edges are set but centers still look slightly underdone.
Cool
  1. Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack, so they firm up as they cool.

Notes

For thicker, chewier cookies, chill the dough 10 minutes if your kitchen is warm (not required). Store in an airtight container at room temperature for 4 days. Freeze baked cookies for up to 2 months. For a gluten-free swap, use certified gluten-free oats.