Did you make this? Snap a photo and tag us on Instagram at @thrivinghome so we can see your creations and cheer you on!

Monster Cookies

Monster Cookies are the all-in-one kind of cookies to bring happiness in every bite.

Yield: 28 cookies 1x
Prep: 10 minutesCook: 12 minutesTotal: 22 minutes


  • 1/2 cup butter (1 stick), 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 cup old-fashioned oats (Quick oats will work in a pinch. For gluten free option: use gluten free oats.)

Before You Begin! If you make this, please leave a review and rating letting us know how you liked this recipe! This helps our business thrive & continue providing free recipes.


  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. 
© Author: Thriving Home
Cuisine: American Method: Bake