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+ servings

How to Video

Two monster cookie halves stacked on top of each other.

Monster Cookies

Our Monster Cookies combine rich peanut butter with the sweet crunch of M&M's and chocolate chips. Brown sugar and vanilla add depth, while old-fashioned oats provide a hearty chew. Perfect for any occasion, these cookies promise a delightful mix of flavors that will leave you craving more.
4.80 from 5 votes
Yield: 28 cookies
Prep Time:10 minutes
Cook Time:12 minutes
Total Time:22 minutes

Ingredients
 

  • 1/2 cup (1 stick) unsalted butter (softened)
  • 1 1/2 cups peanut butter
  • 1 cup brown sugar
  • 1 cup white sugar
  • 2 teaspoons baking soda
  • 3 eggs
  • 2 teaspoons vanilla
  • 1 cup M&M's
  • 1 cup chocolate chips
  • 4 1/2 cups old-fashioned oats (Quick oats will work in a pinch.)

Instructions
 

  1. Preheat the oven to 325°F and line two large baking sheets with parchment paper (or spray the sheet pans with cooking spray).
  2. In a large mixing bowl combine butter, peanut butter, brown sugar, white sugar, baking soda, eggs, and vanilla. Stir until well combined.
  3. Stir in the M&Ms, chocolate chips, and the oats.
  4. Using a 1/4 measuring cup to scoop dough onto lined baking sheets.
  5. Bake for 10-12 minutes (depending on size). They will appear a tad gooey but that's ok!
  6. Let cookies cool for at least 30 minutes on baking sheets before removing them. 

Freezer Instructions

Freeze for Later: Scoop or shape the dough, place on a baking sheet to flash freeze, then transfer to an airtight container or freezer bag. Freeze for up to 3 months. Or you can freeze baked cookies (remove as much air as possible) for up to 3 months.
Make from Frozen: Bake straight from frozen—just add 1–2 minutes to the baking time.

Notes/Tips

  • You must let them cool down for at least 30 minutes before eating.
  • Do not over bake. They will look undercooked at 10-12 minutes but take them out anyway!
  • While oats are naturally gluten-free, oftentimes they're processed in a factory where cross-contamination can happen. Look for a "certified gluten-free" label on your oats, if avoiding all gluten is important to you.
  • While it's tempting, don't worry about pressing the dough the down after scooping. They'll flatten out on their own. 

Nutrition

Serving: 1 cookie | Calories: 396 kcal (20%) | Carbohydrates: 52 g (17%) | Protein: 10 g (20%) | Fat: 18 g (28%) | Cholesterol: 28 mg (9%) | Sodium: 155 mg (7%) | Fiber: 5 g (21%) | Sugar: 24 g (27%)
If you make this, please leave a review and rating letting us know how you liked this recipe!
Author: Polly Conner