Monster Cookies with Peanut Butter

If you are looking for an easy recipe for monster cookies with peanut butter and oats, this has become one of our family’s favorite cookies.

I have always loved to bake cookies with my kids and for my family. We like the traditional chocolate chip cookies as well as chocolate chip shortbread cookies. Can you ever go wrong with a chocolate chip cookie? We also like chocolate cookies with peanut butter chips and super soft cookies with M&Ms.

It’s probably the reason we love monster cookies so much because they combine parts of all our favorite cookies – chocolate chips, peanut butter chips AND M&Ms.

Even better, you add in some peanut butter and oats which make an amazingly soft cookie with all the delicious add ins that everyone loves. The peanut butter really adds an important flavor to these cookies that is necessary for a good monster cookie.

My kids often ask why they are called monster cookies. Our reasoning is that Cookie Monster loves cookies and these include all the best parts of every cookie recipe – hence the name “Monster Cookies.”

These cookies are easy to make with regular pantry ingredients. I often bake a batch and then freeze some for school lunches or to enjoy later. They freeze perfectly and taste just as good when thawed as they do fresh.

The other nice thing about monster cookies? They are very forgiving. Forget to buy peanut butter chips? Toss in some extra chocolate chips. Use holiday M&Ms for a festive holiday cookie. You can actually use any ratio you want of the 3 mix-ins (chocolate chips, M&Ms and peanut butter chips) within the 2.5 cup measurement. And if you want to toss in an extra half cup? I am sure Cookie Monster would approve.

A good friend has called them “soft balls of cookie dough” and even though he doesn’t usually eat sweets, he will eat multiples whenever I bake monster cookies! They are also my kids current favorite cookie to take in their packed lunches to school. But you don’t have to take my word for it. Try these cookies for yourself and let me know what you think. I am confident you will love them as much as we do!

I got the original monster cookie recipe from The Girl Who Ate Everything and tweaked it over the years to end up with the following recipe.

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Here’s our favorite recipe for monster cookies with peanut butter.

Monster Cookie Ingredients:

3/4 cup butter
1/2 cup sugar
1 cup brown sugar
2 eggs
1 teaspoon vanilla
1 teaspoon baking soda
1/2 cup creamy peanut butter
2 cups flour
1 1/2 cups old fashioned oats
1 cup semi-sweet chocolate chips
1 cup M&Ms
1/2 cup peanut butter chips

How to Make Monster Cookies:

Preheat the oven to 350 degrees.

In your mixer, cream together butter with the brown sugar and white sugar.

Add eggs, vanilla and baking soda. Add in peanut butter and mix until all ingredients are combined.

Slowly add in flour next. Add flour a half cup at a time until all the flour is mixed into the cookies. (Adding the flour before the oats helps eliminate flour flying everywhere! Trust me. #LessonLearned)

Next, add in the old fashioned oats to your cookie dough and mix until your dough is ready for the adds in.

Add in chocolate chips, peanut butter chips and M&Ms. You can stir by hand or continue to use the mixer (like I prefer to do). It is a heavy dough.

Once your mix-ins are mixed in, scoop the cookies onto an ungreased cookie sheet using a medium size cookie scoop (around 2 tablespoons). I love all my cookie scoops but especially this size!

Press a couple of extra M&Ms into the top of the cookie dough before baking. This is not a necessary step but it does make your cookies look nice!

Bake at 350 degrees for 9 minutes. Some would say 9 to 11 minutes, but I always err on the lower side for these cookies because a soft monster cookie is what makes these cookie so delicious!

Remove cookies to a cooling rack and allow to cool completely before storing or freezing in an air-tight container. This recipe makes around 30 cookies.

Enjoy your delicious monster cookies – just like Cookie Monster would!

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Monster Cookies with Peanut Butter

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If you are looking for an easy recipe for monster cookies with peanut butter and all the mix-ins, this has become one of our family’s favorite cookies. 

  • Author: Kristen of Joyfully Thriving
  • Prep Time: 10 minutes
  • Cook Time: 9 minutes
  • Total Time: 19 minutes
  • Yield: 30 cookies 1x
  • Category: Cookies

Ingredients

Units Scale
  • 3/4 cup butter
  • 1/2 cup sugar
  • 1 cup brown sugar
  • 2 eggs
  • 1 teaspoon vanilla
  • 1 teaspoon baking soda
  • 1/2 cup creamy peanut butter
  • 2 cups flour
  • 1 1/2 cups old fashioned oats
  • 1 cup semi-sweet chocolate chips
  • 1 cup M&Ms
  • 1/2 cup peanut butter chips

Instructions

  1. Preheat the oven to 350 degrees.
  2. In your mixer, cream together butter with the brown sugar and white sugar.
  3. Add eggs, vanilla and baking soda.
  4. Add in peanut butter and mix until all ingredients are combined.
  5. Slowly add in flour next. Add flour a half cup at a time until all the flour is mixed into the cookies. (Adding the flour before the oats helps eliminate flour flying everywhere! Trust me. #LessonLearned)
  6. Next, add in the old fashioned oats to your cookie dough and mix until your dough is ready for the adds in.
  7. Add in chocolate chips, peanut butter chips and M&Ms. You can stir by hand or continue to use the mixer (like I prefer to do).
  8. Once your mix-ins are mixed in, scoop the cookies onto an ungreased cookie sheet using a medium size cookie scoop (around 2 tablespoons).
  9. Press a couple of extra M&Ms into the top of the cookie dough before baking, if you choose.
  10. Bake at 350 degrees for 9 minutes. Some would say 9 to 11 minutes, but I always err on the lower side for these cookies because a soft monster cookie is what makes these cookie so delicious!
  11. Remove cookies to a cooling rack and allow to cool completely before storing or freezing in an air-tight container.
  12. Enjoy your delicious monster cookies!

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