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Monster Cookies

Monster cookies are thick, chewy peanut butter cookies loaded with M&Ms in every color, chocolate chips, and oats visible in every bite. They bake with golden edges and soft centers for an easy gluten free style no-flour cookie texture.
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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
  

Peanut butter cookie base
  • 1.5 cup creamy peanut butter
  • 1 cup brown sugar, packed
  • 0.5 cup granulated sugar
  • 3 large eggs
  • 2 tsp vanilla extract
  • 1 tsp baking soda
  • 3 cup quick-cooking oats
  • 1 cup M&Ms (red, white, and blue for patriotic version)
  • 0.5 cup chocolate chips
  • 0.5 cup mini chocolate chips

Equipment

  • 1 sheet pan

Method
 

Prep the oven and dough
  1. Preheat oven to 350°F and line two baking sheets with parchment paper so the cookies bake evenly and release cleanly.
  2. Beat peanut butter, brown sugar, and granulated sugar together until combined and glossy.
  3. Add eggs, vanilla, and baking soda, then mix until smooth.
  4. Stir in quick-cooking oats until fully incorporated so the dough thickens and oats are visible throughout.
  5. Fold in M&Ms and both types of chocolate chips so they’re evenly distributed in the dough.
Shape and bake
  1. Scoop dough into 2-tablespoon balls and place 2 inches apart on the prepared baking sheets, flattening slightly with your palm for even spreading.
  2. Bake for 10–12 minutes at 350°F until edges are set but centers still look slightly underdone for a soft, chewy finish.
Cool and firm up
  1. Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack—cookies firm up as they cool.

Notes

For the thick, chewy texture, don’t overbake—pull them when the centers still look a touch underdone. Store airtight at room temperature up to 5 days; refrigerate up to 7 days. Freezing is yes (freeze baked cookies up to 2 months, thaw at room temperature). Dietary swap: use dairy-free chocolate chips if you want a dairy-free version.