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Monster Cookies

Monster cookies are thick, chewy no-flour-style peanut butter cookies loaded with M&Ms in every bite. This easy American recipe uses oats for a soft center and golden edges, baked until the middle looks slightly underdone.
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Prep Time 15 minutes
Cook Time 12 minutes
Total Time 27 minutes
Servings: 24 servings
Course: Dessert
Cuisine: American
Calories: 245
Ingredients Equipment Method Notes

Ingredients
  

Peanut butter cookie dough
  • 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
 

Preheat and prep
  1. Preheat the oven to 350°F and line two baking sheets with parchment paper.
  2. Beat the peanut butter, brown sugar, and granulated sugar together in a large bowl until combined.
Mix the dough
  1. Add the eggs, vanilla, and baking soda and mix until smooth, looking glossy and fully incorporated.
  2. Stir in the quick-cooking oats until fully incorporated, then fold in the M&Ms and both kinds of chocolate chips so they’re evenly distributed.
Shape and bake
  1. Scoop the dough into 2-tablespoon balls and place them 2 inches apart on the prepared baking sheets, flattening slightly with your palm so they spread evenly.
  2. Bake for 10–12 minutes at 350°F until the edges are set but the centers look slightly underdone, with a lightly golden rim.
  3. Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack where they firm up as they cool.

Notes

Pro tip: for the thick, chewy texture, keep the dough balls uniform (about 2 tablespoons) and avoid overbaking—pull them when the centers still look a bit soft. Store in an airtight container at room temperature for up to 5 days. Freezing is yes: freeze baked cookies up to 2 months. For a dietary swap, use a certified gluten-free oats if you want gluten-free cookies.