These Best Ever Monster Cookies are loaded with M&M candies, peanut butter, and oats. They’re incredibly chewy and delicious, making them the best cookies ever!
These monster cookies are an absolutely delicious combination of peanut butter, oats, chocolate, and butter. And let’s not forget the added indulgence of chocolate chips and M&M’s! Trust me, they are a “beast” of a cookie that you won’t be able to resist!

This Monster Cookie recipe is the ultimate and unbeatable version of this classic treat. With everyone having their own variations, this recipe stands out as the best.
What are monster cookies?
Monster cookies are a delightful treat packed with a variety of delicious ingredients. With endless possibilities, these cookies can be customized with peanut butter, oats, chocolate chips, M&Ms, and more!
This recipe is all about simplicity. No need for nuts or butterscotch chips – it’s better left uncomplicated. And of course, monster cookies are never complete without peanut butter! No need to ask me twice. 😉

I can’t resist eating this dough all day long! My sisters and I always joke about overindulging while making these cookies. If you don’t eat at least 6 cookies worth, then you didn’t make them right.
This recipe is guaranteed to delight even the most discerning fan of monster cookies! Go ahead and enjoy this classic cookie with your loved ones. Don’t forget to share your feedback in the comments section below. Bon appétit!
Ingredients
- Brown sugar
- White sugar
- Softened butter
- Eggs
- Vanilla
- Honey
- Peanut butter
- Baking soda
- Rolled oats & Quick Oats
- Flour
- Semi-sweet chocolate chips
- M&M’s

Recipe tips for baking cookies
- A great tip for these cookies: if you prefer M&M’s over chocolate chips, double the amount of M&M candies for an extra treat. Kids love it this way!
- Be sure to use a combination of rolled oats and quick oats. If you don’t have both on hand you can easily swap them out for each other.
- Creamy peanut butter is the go-to choice, but you can opt for chunky if you prefer a varied texture.

More Favorite Recipes
Now because I love chocolate, peanut butter and oats, I of course just don’t make these Best Ever Monster Cookies regularly but these cookies as well: Best Ever Soft Peanut Butter Cookies, Gluten-Free Peanut Butter Cookies (no oats), and Rolo Stuffed Peanut Butter Cookies.
Our favorite cookie recipes
- Best Ever Soft Sugar Cookie
- Grandma’s Ginger Cookies
- Best Ever Chewy Chocolate Chip Cookies
- German Chocolate Cake Cookies
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Best Ever Monster Cookies

Ingredients
- 1/2 cup brown sugar
- 1/2 cup white sugar
- 1/2 cup butter softened to room temperature
- 1 egg
- 1 teaspoon vanilla
- 1/2 cups peanut butter I use creamy
- 1/2 teaspoon baking soda
- 1/2 teaspoon baking powder
- 2/3 cup rolled oats not quick oats!
- 2/3 cup quick oats
- 1 cup flour
- 3/4 cup semi-sweet chocolate chips
- 1 1/4 cups M&M's
Instructions
- Preheat oven to 350 degrees F (175 degrees C).
- Beat butter, sugars, and eggs together until light and fluffy.
- Add the remaining ingredients in order, mixing well.
- Use a cookie dough scoop to drop on ungreased cookie sheet. Bake for 12 to 15 minutes.
- Let cool for a couple of minutes to set before placing on cooling rack. Enjoy!
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These are THE BEST cookies I have ever made. Seriously. The recipe is easy to follow and they turned out perfect. I can’t stop eating them!
I am so glad to hear you liked them! Thank you for sharing!
I made these cookies for a work party and ppl raved over them,they were so delicious,I used my convection button on my stove and cooked them for 11 minutes,they came out perfect,thanks for the great recipe❤
Awesome!!! My mom just made them yesterday for my kids when they all went up skiing, we love it too!
This cookie looks delightful!
THIS is the classic recipe I remember, so thank you for leaving it uncomplicated! It’s my go-to recipe now, so yummy!
These cookies have so much going on – we loved them!
These cookies are so good at And everyone loved them!
These cookies are going to be a big hit here! So excited to give this a try! My family is going to love these cookies!
My family will go crazy over these cookies! We need to make them next weekend!
These cookies are amazing! My family loved them and I am making it very often!
These really are the best ever monster cookies! My family loves them…. Thanks so much for sharing!
You are so welcome – here is that original recipe you loved so much
https://dashofsanity.com/simplified-monster-cookies/
Looks totally irresistible! I’m excited to make this!
My kids beg me to make these all the time! Thanks for the recipe!
I kept the cookies in an airtight container to keep them fresh. So they were able to keep their freshness for a longer time. Monster cookies have a really colorful appearance. A fun snack, especially for children.
My recipe says 1 cup of flour? Was this esited? Previous replies so no flour. I doubled it so two cups. They didn’t spread at all. Wish I had read reviews first.
Hi Sara –
1 cup of flour! I updated the recipe to be with flour, after perfecting it, I have another recipe on my site that has the no flour – here it is. https://dashofsanity.com/simplified-monster-cookies/
I’ve been making these for years. They are my go to, but these are not the same cookies. The original recipe had multiple eggs, more PB, rolled oats and no flour. Does anyone know where I can find that recipe????? Please help!
Here you go – https://dashofsanity.com/simplified-monster-cookies/
Seriously, why did the recipe change??? I fortunately had the old one printed out.
1.5 C brown sugar, 1 C sugar, 1/2 C softened butter, 3 eggs, 1tsp vanilla, 1 TB honey, 1.5 C peanut butter, 2 tsp baking soda, 4.5 C rolled oats SPECIFICALLY SAYS NOT QUICK OATS, 1 cup semisweet chocolate chips, 11.4 oz bag M&Ms.
Cream together butter, sugars and eggs, add rest of ingredients in order. Bake at 350 for 12-15.
Thank you for this! I thought it was different! I liked the previous one because it was gluten free
Here is the one you are referring to – https://dashofsanity.com/simplified-monster-cookies/
Did you change this recipe? I’ve made it in the past but I remember it being flour free
Here is the original one – https://dashofsanity.com/simplified-monster-cookies/