Monster Cookies

Are you ready to be introduced to the one of the best cookies ever created? Meet these homemade Monster Cookies filled with chocolate chips and M&Ms!

If cookies are your thing make sure to try out my Salted Browned Butter Chocolate Chip Cookies too!

Monster Cookies are Oatmeal M&M Peanut Butter Cookies on a wore rack

Soft and Chewy Monster Cookies

If you’re on what feels like your 1000th batch of chocolate chip cookies 1) that’s awesome and I want to be friends, and 2) consider switching up your routine with these Monster Cookies!

They’re made from scratch with peanut butter cookie dough and chocolate chip and M&M add ins! These homemade cookies have got the perfect amount of crispy crunchiness on the edges, and soft chewiness in the middle. Plus, when they’re warm from the oven, the chocolate will literally melt in your mouth. Just try and name a better dessert!

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What are Monster Cookies?

All monster cookies are made with peanut butter, oats, chocolate chips, and M&Ms in them. Basically, all of the good stuff packed into one cookie. I like to add in raisins while I’m at it, because why not?

I’m not really sure why they’re called ‘monster cookies,’ but some people think it’s because all of the lumps and different colors make them look monster-like. Whatever the reason is, nobody can deny that they are monstrously delicious!

Peanut butter chocolate chip cookies.

Recipe Ingredients

The ingredients for this peanut butter and oat cookie recipe are pretty standard. Making these cookies from scratch is no stress!

  • Butter: let it come to room temperature to make mixing easier.
  • Creamy Peanut Butter: I don’t recommend using natural peanut butter.
  • Light Brown Sugar: packed.
  • Granulated Sugar
  • Eggs: it’s not a bad idea to let these come to room temperature too.
  • Vanilla Extract: for extra sweet vanilla flavor!
  • Baking Soda: will help your cookies rise up nice and tall.
  • Kosher Salt: if using regular-sized salt granules, reduce the amount of salt.
  • All Purpose Flour
  • Rolled (Old Fashioned) Oats: quick oats work really well, too.
  • Semi-Sweet Chocolate Chips: you can also use milk chocolate chips.
  • M&Ms: or mini M&Ms if you feel like it!
  • Optional: 1/2 cup peanut butter chips and/or 1 cup raisins

How to Make Monster Cookies

These chocolate chip M&M cookies are made in 6 easy steps. Just mix everything together, pop your cookies in the oven, and wait for that wonderful, freshly-baked cookie smell to start wafting through the kitchen!

Mix Peanut Butter & Sugar: In the bowl of your stand mixer fitted with the paddle attachment, mix the butter, peanut butter, brown sugar, and granulated sugar together on medium speed for 2 minutes.

Combine with Eggs: Add in the eggs one at a time, vanilla extract, baking soda, and salt and mix until smooth for 1 minute, scraping the sides of the bowl as necessary.

Add in Flour: Turn the mixer to low and add in the flour, mixing until combined. Slowly add in the oats and mix until incorporated.

Mix in Chocolate Chips: Stir in the chocolate chips, M&Ms, and other optional add-ins. Cover the bowl and refrigerate the dough for at least 2 hours.

Let Dough Come to Room Temp: Preheat oven to 375°F. While the oven is preheating, remove the dough from the refrigerator to take the chill off.

Bake Cookies: Line your baking sheet with parchment paper. Using a medium (2- tablespoon) cookie scoop, portion out the dough and place 2- inches apart on the baking sheet. Bake for 10 – 12 minutes, until lightly golden. Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rock to cool completely.

Chocolate chip M&M cookies.

Tips for the Best Cookies

So now that I’ve convinced you that these peanut butter cookies are the best things ever, here are some tips to help you get the best results:

  • Let Refrigerated Ingredients Come to Room Temp: it’s a lot easier to mix the cookie dough when the eggs and butter have come to room temperature, so I highly recommended taking the time to do that.
  • If You Don’t Have a Stand Mixer: that’s okay! You will have a lot of stirring ahead of you, but you can definitely still make these cookies.
  • Don’t Over-Bake the Cookies: if they still look a little underdone when it’s time to pull them out, take them out of the oven anyway and let them finish baking as they cool on the cookie tray.

How to Store Homemade Cookies

Store these yummy Monster Cookies in an airtight container at room temperature for up to 3 days.

Can I Freeze the Cookie Dough?

You can freeze the cookie dough or the baked cookies for up to 30 days. See this post on How to Freeze Cookie Dough for all of the details!

Monster cookies on a cooling rack.

More Easy Cookie Recipes to Try:

Everybody loves a good cookie! Try out some of these other easy cookie recipes:

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Monster Cookies

  • Author: Shelly
  • Prep Time Prep Time: 10 minutes
  • Cook Time Cook Time: 10 minutes
  • Total Time Total Time: 2 hours 25 minutes
  • Yield Yield: 36 cookies 1x
  • Category Category: Dessert
  • Method Method: Oven
  • Cuisine Cuisine: American

Description:

Ready to try one of the best cookie recipes ever? These Monster Cookies are packed with chocolate chips, M&Ms, oats, and peanut butter; don’t miss out on these chocolate-y homemade cookies!


Scale

Ingredients:

  • 3/4 cup butter, room temperature
  • 2 cups creamy peanut butter
  • 1 1/2 cups light brown sugar
  • 1 1/2 cups granulated sugar
  • 5 large eggs
  • 1 tablespoon vanilla extract
  • 2 teaspoons baking soda
  • 1 teaspoon kosher salt
  • 3/4 cup all purpose flour
  • 5 1/2 cups rolled (old fashioned) oats
  • 1 cup semi-sweet chocolate chips
  • 1 cup M&Ms
  • Optional – 1/2 cup peanut butter chips and/or 1 cup raisins

Instructions

  1. In the bowl of your stand mixer fitted with the paddle attachment mix the butter, peanut butter, brown sugar, and granulated sugar together on medium speed for 2 minutes.
  2. Add in the eggs one at a time, vanilla extract, baking soda, and salt and mix until smooth for 1 minute, scraping the sides of the bowl as necessary.
  3. Turn the mixer to low and add in the flour, mixing until combined.
  4. Slowly add in the oats and mix until incorporated.
  5. Stir in the chocolate chips, M&Ms, and other optional add-ins.
  6. Cover the bowl and refrigerate the dough for at least 2 hours.
  7. Preheat oven to 375°F. While the oven is preheating, remove the dough from the refrigerator to take the chill off.
  8. Line your baking sheet with parchment paper. Using a medium (2- tablespoon) cookie scoop, portion out the dough and place 2- inches apart on the baking sheet.
  9. Bake for 10 – 12 minutes, until lightly golden. Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.

Notes:

Store airtight at room temperature for up to 3 days.
Freeze dough or baked cookies for up to 30 days. See post about freezing cookie dough for tips.

Keywords: monster cookies, monster cookies recipe, peanut butter oat cookies, easy homemade cookie recipes, chocolate chip m&m cookies, best cookies

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Chocolate chip M&M cookies on a cooling rack.

Hi! I’m Shelly and I’m an addict. Of the buttercream sort. I started this site a few years ago as a way to justify my sugary, buttery obsession with desserts. It has worked out well for me so far, because as it turns out you guys all love sugary, buttery desserts too! It feels good to know you're not alone, doesn’t it?

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Amanda
February 17, 2021 10:23 am

Shelley!!! I made these with a twist and they were SO GOOD. My husband doesn’t like M&M’s in his cookies and we didn’t have raisins. I did however have unsweetened coconut, so we threw that in. Just oatmeal, peanut butter chocolate chip coconut cookies and they are amazing!!

priyakitchenette.com
February 9, 2021 11:22 pm

These are wonderful – even frozen!

Kimberli
February 6, 2021 10:26 am

These were by far the best monster cookies I’ve ever had, I promptly deleted all my other recipes! This is my all time favorite cookie, so I’m very excited to have found yours, SO soft & chewy! I took them to work for our super bowl party yesterday & they were a hit, my boys were disappointed that I didn’t bring any home!

Michelle Bruneau
February 1, 2021 12:20 pm

My mom made these when I was growing up, and I always thought they were called monster cookies because the recipe was HUGE! Like 2 lb brown sugar, 12 eggs, 3 lb peanutbutter, 1 lb butter (among other ingredients) massive! She mixed them by hand in the kitchen sink because it was too much for the mixer!

fred
February 4, 2021 9:18 pm

Yes, that’s how my recipe is too. Also, my recipe is flour free so it could be gluten free, except it uses 18 cups!!! of oats, so unless you have to be gluten free it is a little pricey to use gf oats. Also some people make the cookies extra big, the size of saucers.

Linda
February 1, 2021 8:57 am

I use a flour-free recipe that is wonderful. 1 C brown sugar, 1 C white sugar, 1/2 C butter, 3 eggs, 1 t vanilla, 3/4 t. corn syrup, 1/2 C butter, 1 1/2 C peanut butter, 2 t. baking soda, 4 1/2 C quick oatmeal, 1 1/4 C chocolate chips, 1 1/4 C M & M’s. Heat oven to 350 degrees. In large bowl cream sugars & butter. Add eggs, vanilla, syrup, & peanut butter. Add soda to oatmeal & add to above mixture. Add chocolate chips & M & M’s. Bake 8-10 minutes. I use regular and peanut M… Read more »

Tonia
February 1, 2021 8:47 am

If I’m about a cup and a half short of rolled oats can I throw in some quick cooking oats to finish it off?

Kimberli
February 6, 2021 10:24 am
Reply to  Tonia

I used a combination of rolled & quick oats & they turned out perfectly, she says in the post above the recipe that it’s fine!

Shelly Hi! I’m Shelly and I’m an addict. Of the buttercream sort. I started this site a few years ago as a way to justify my sugary, buttery obsession with desserts. It has worked out well for me so far, because as it turns out you guys all love sugary, buttery desserts too! It feels good to know you're not alone, doesn’t it?

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