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  • 1 lb. Softened Butter
  • 2 lbs. Brown Sugar
  • 4 Cups White Sugar
  • 12 Eggs
  • 8 Teaspoons Baking Soda
  • 1 Tablespoon Vanilla
  • 3 lbs. Chunky Peanut Butter
  • 12 ounces Chocolate Chips
  • 1 lb. M&Ms
  • 19 Cups Old Fashioned Oats

Monster Cookies

A classic cookie that will please a crowd.

4 hours

Serves: 156


Easy to make cookies with M&MS, chocolate chips and peanut butter that freeze well.

Monster Cookie Ingredients

These monster cookies are a classic recipe but, boy oh boy, is it a BEAST! Grandma’s recipe here is just enormous and will definitely feed a crowd. I halved the recipe which still made about 6 1/2 dozen cookies. The great thing about these cookies is they freeze well. Just take whatever you won’t eat soon and pop them in the freezer for a great anytime snack. Mom swears these are breakfast cookies because of all the oatmeal. Can’t say I can argue with that!

The big challenge with these monster cookies is just how much dough there is—even when you just do half. I started it in my kitchen aid stand mixer, but had to switch to a new bowl right after adding the peanut butter. At that point though really, it’s almost easier to mix by hand anyway. Which is still quite a workout.

Another thing to note is how wet the dough is when baking. When I first pulled them out of the oven, they didn’t look done. I left them on the tray for a few minutes to help them set and they really did. So, when you get them out of the oven, don’t fret over how they look too much. They will kind of collapse and be perfect. The good thing is, with these ingredients, the baking step isn’t quite so sensitive. If you bake them a little over or under it won’t really affect them too much.

I hope you enjoy these as much as we do!

Monster Cookie Recipe


  • Preheat Oven to 300º 
  • Cream Butter and Sugar 

    Make sure your butter is at room temperature and good and soft. Add the brown and white sugar and cream all three ingredients together.

  • Add Eggs 

    Add eggs to the butter and sugar mixture one at a time making sure each is incorporated before adding the next.

  • Add Baking Soda and Vanilla 

    Add the baking soda and the vanilla extract or paste and fully incorporate.

  • Add Peanut Butter 

    Add the peanut butter and mix to combine. This was the limit for my stand mixer and I had to switch to a new bowl and a hand mixer after this step!

  • Add Oatmeal 

    For this step I had to get out a new bowl and through my dough mixture in it to proceed. After that, I added the oatmeal in two batches, mixing well after each. I used a hand mixer, but doing it by hand with a wooden spoon might have been just as easy.

  • Add Chocolate Chips and M&Ms 

    Now it's time to add the good stuff! Add the chocolate chips and M&Ms and mix to combine. At this point, you almost have to do it by hand. Good luck.

  • Scoop Onto Trays 

    Scoop out the dough onto your trays with an ice cream scoop. (These make big cookies!)

  • Bake for 10-12 Minutes 

    Now bake the cookies in batches for 10-12 minutes. When they come out of the oven they will look wet and still "doughy" but they will set. Leave them on the tray for about 2-3 minutes before transferring to a wire rack to cool. Continue until you've baked all the cookies.



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