Monster Cookies

Thick and Chunky Monster Cookies


Monster cookies have become a favorite in our house these days.  There is always discussions about how many someone ate and how many are remaining. These cookies really are a wonderful treat.  Loaded with M&M’s, chocolate chips, peanut butter, butterscotch and oats.  The oats make them healthy, right? Well, I’m going with “yes”.

Monster Cookies - Thick, soft, chunky and absolutely our favorite recipe!

These Monster cookies are not your average size cookie.  They are large and oh so thick!

Monster Cookies - Thick, soft, chunky and absolutely our favorite recipe!

See! Look at that baby! So amazing! We use the mini M&M’s because we prefer the smaller crunch but if you prefer the regular size go for it. I don’t mind.

5.0 from 2 reviews
Monster Cookies
Prep time
Cook time
Total time
Thick, soft, chunky Monster Cookies will be your new favorite cookie.
Recipe type: Dessert
Serves: 16-18
  • ½ cup butter, softened to room temperature
  • ½ cup creamy peanut butter
  • ¾ cup brown sugar
  • ¼ cup white sugar
  • 2 eggs
  • 2 teaspoons vanilla extract
  • 1 teaspoon baking soda
  • ½ teaspoon salt
  • 2 teaspoons cornstarch
  • 1½ cups all-purpose flour
  • 1 cup old-fashioned oats
  • 1 cup mini M&M's candies
  • ½ cup mini semi-sweet chocolate chips
  • ½ cup butterscotch chips
  1. In the bowl of a stand mixer, cream together the butter and peanut butter until smooth.
  2. Add in the brown sugar & white sugar, creaming together until fluffy.
  3. Add in the eggs and vanilla, beating well.
  4. In a separate bowl, mix the baking soda, salt, cornstarch, and flour, until combined.
  5. Then add the dry ingredient mixture to the wet ingredients.
  6. Stir in the oats, M&M's, chocolate chips and buttercotch until just combined.
  7. Cover and refrigerate dough for at least 2 hours, up to overnight. (we refrigerate overnight)
  8. Preheat oven to 350 degrees F. Line 2 baking sheets with parchment or silicone liners.
  9. Drop heaping ¼ cup-sized balls of dough onto the baking sheets, about 2-3" apart.
  10. Bake for approximately 12-14 minutes, rotating pans halfway through baking time to ensure even cooking. Cookies may appear slightly undone in the center; this is normal and they'll continue to set as they cool.
  11. Cool on the baking sheet for at least 5 minutes then transfer to racks.
Monster Cookies - Thick, soft, chunky and absolutely our favorite recipe!


Recipe inspired by TheGirlWhoAteEverything


  1. Reply

    Thank you for posting the recipe for these delicious cookies! Perfect for parties and gatherings. – Suzie

    1. Reply

      Thank you, Suzie! 🙂

  2. Reply

    These cookies look wonderful for those lazy afternoons where you can lounge around snacking, or anytime, really. 🙂 Love all the add ins!

    1. Reply

      Thank you they are really tasty! 🙂

  3. Reply

    My kids would love these! Thanks for sharing at Merry Monday! 🙂

  4. Reply

    Your Monster Cookies will be a big hit with the little Monsters here. Your recipe looks awesome and thanks so much for sharing it with us at Full Plate Thursday. Have a great day and come back to see us real soon!
    Miz Helen

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