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Monster Cookies

Monster cookies are thick, chewy peanut butter no-flour-style treats with oats visible in every bite and M&Ms in every color. This easy cookie recipe bakes golden-edged with soft centers using a quick mix-and-scoop method.
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Prep Time 15 minutes
Cook Time 12 minutes
Total Time 27 minutes
Servings: 24 servings
Course: Dessert
Cuisine: American
Calories: 250
Ingredients Equipment Method Notes

Ingredients
  

Ingredients
  • 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
  1. Preheat the oven to 350°F and line two baking sheets with parchment paper, keeping the sheets ready to load.
  2. Beat the peanut butter, brown sugar, and granulated sugar together in a large bowl until combined and glossy.
Mix the dough
  1. Add the eggs, vanilla extract, and baking soda, then mix until smooth and no streaks remain.
  2. Stir in the quick-cooking oats until fully incorporated, so the dough looks thick with visible oat bits.
  3. Fold in the M&Ms and chocolate chips until evenly distributed throughout the dough.
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 bake evenly.
  2. Bake for 10–12 minutes at 350°F until the edges are set but the centers still look slightly underdone, which will firm up after cooling.
  3. Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack where they finish setting as they cool.

Notes

Pro tip: Slightly underbake at 10–12 minutes so the centers stay soft and chewy when cooled. Store airtight in the refrigerator up to 5 days for best texture; freeze baked cookies up to 2 months. For a dairy-free swap, use dairy-free chocolate chips without changing the method.