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!


  • 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

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Best Ever Monster Cookies

Prep: 10 minutes
Cook: 12 minutes
Total: 22 minutes
Servings: 36 cookies
Calories: 150 kcal
Best Ever Monster Cookies are loaded with M&M candies, peanut butter, and oats. These are soft, chewy and irresistible, making them the best cookie ever.


  • 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


  • 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!


Calories: 150kcalCarbohydrates: 18gProtein: 2gFat: 8gSaturated Fat: 4gPolyunsaturated Fat: 1gMonounsaturated Fat: 2gTrans Fat: 0.1gCholesterol: 13mgSodium: 59mgPotassium: 68mgFiber: 1gSugar: 12gVitamin A: 103IUVitamin C: 0.04mgCalcium: 21mgIron: 1mg
Tried this recipe?Let us know what you think!

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      1. But why did you change it?? I loved the no flour and with honey recipe. It was my go to cookie for freezer cookies and amazing for my family with celiac. Of course I never wrote it down and now I don’t know what the original was.

  1. Hi Sandra!

    This sounds so delicious and i am wondering if you have ever baked this in brownie form or bars? If so what was the baking time?

  2. My cookies turned out to be super flat and burned on the edges and too soft in the centres. Followed all directions and and they were only in the oven for 8 minutes. What did I do wrong?!

  3. As a cookie fanatic, I have tried several monster cookies recipes (usually ones with flour). This is by far my favorite recipe! Soft and chewy 🙂 My hubby and I both brought some to work and they were gone immediately!

  4. Ok, midway through this recipe and struggling…. the butter, is it melted? Softened? Cold? I put it in room temp and it’s clumpy. Do you blend after you add each ingredient or add them all and then mix? Thanks!

  5. Found your recipe on Pinterest. I think you are right, these really are the best monster cookies ever. And the dough…! Exactly as described! Thanks for sharing!

  6. Omg, until I read the comments I didn’t even notice these cookies have no flour in them!! We like the cookies except I think they are a little bland.

  7. These are SO good! We used the biggest cookie scoop size (about 1/4 cup) and they took about 14 minutes to bake. And we didn’t have any M&Ms so we used a mix of milk and white chocolate chips. Thanks Sandra!

  8. I use this same recipe except I use stick margarine and karo syrup instead of honey. Everyone always says they’re the best cookies they’ve ever had! And I love that my celiac coworkers can eat these!

  9. Just read the recipe & will be making this. The only trouble I have had so far is that I can’t print it.

  10. Just finished making 2 batches for our soccer team dinner tomorrow night and my husband and our exchange student have demolished at least 6 cookies each. This is a keeper recipe for us. Thanks for sharing!

  11. Love this recipe!! Real Monster cookies do NOT have flour. These are perfect and exactly right!!!

  12. I had the same issues with my batch of cookies as Jere. The cookies turned out crispy on the bottom and edges while doughy on the top. I even tried rotating the pans in the oven midway through the baking time and reducing the baking time. I will be deleting this recipe from my board.

  13. Lady, you’ve awoken an anger inside me I didn’t know existed. I followed your recipe to a T and now I have flat, crusty “cookies” that have ruined my brand new cookie sheet. Upon viewing your video (after baking) you don’t even follow your own directions! This probably needs flour. Or an exorcist. Or both.

    -pregnant and HANGRY

    1. The recipe was vague in a couple thingd including size of cookie to make. Finding have cookie dough scoops and there are different sizes. I did a little more than tbsp and baked 11 min and they are perfect. Her bake time was too long and minivan runs hot. Also parchment paper helps keep pans clean and when it goes badly it is easy to clean up. Hope this helps!

    2. 5 stars
      I have been making these cookies for years for my kids and they are scrumptious every single time I make them, no complaints in the bunch! I don’t know what some of you are doing wrong but there IS and NEVER HAS BEEN any flour in this cookie recipe as long as I’ve been making them!! I’d say……look at different Cookie Monster recipes and notice the likes and the differences and try again, you had to have done something wrong or left something out! Good Luck!

    1. 5 stars
      You can try whatever you like, but it will change the taste of the original monster cookies though! JS! But I’d say…….give it a try, can’t hurt!

  14. I agree the dough is delish. However, the baked cookies were burnt on the bottom with the recommended 12 minutes. I had to go down to 8 minutes. I also had to chill the dough before scooping as none of the M&Ms or chocolate chips would mix into the dough. I followed the recipe to a T so I won’t be making it again. Still on the search for the perfect monster cookie recipe!

    1. Glad you liked the dough, sorry the cookie part didn’t meet your expectations. They are still our favorite. If you try again then chill and bake for reduced time. San

      1. Flat, burnt, but not altogether horrible. They were still edible, however, they were called vomit cookies at our home. So which is it? 1 1/2cups butter and 1/2 cup peanut butter, or 1 1/2 cups peanut butter and 1/2 cup butter? My wife would say I was a bit ticked at the discrepancy!! Good thing 5yr olds are easy to please!!

        1. Sorry we switched recipe cards this week on the my site and not sure how that switched, but it is 1/2 cup butter and 1 1/2 cups of peanut butter – hope this helps next time.

  15. I believe there is a typo in your recipe. The online version says 1 1/2 cups butter and 1/2 peanut butter. BUT if you select print recipe, you will find those measurements to be switched. Which is the correct way to bake these cookies?

      1. Ummm, I really want to try this recipe but is the nutrition label correct??? That’s a lot of calories for one cookie

  16. The directions say to beat the eggs then add the rest of the ingredients? Do you not cream the butter and sugar first? The directions seem counter intuitive…

  17. Omg, these cookies are amazing! Maybe the best cookie I have ever eaten in my entire life lol…but hey, I am a peanut butter, oats, and m&m lover. Mine baked for about 11 mins and turned out perfectly! I also used natural on and that worked well.

  18. 5 stars
    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!

  19. 5 stars
    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❤

    1. Awesome!!! My mom just made them yesterday for my kids when they all went up skiing, we love it too!

  20. 5 stars
    THIS is the classic recipe I remember, so thank you for leaving it uncomplicated! It’s my go-to recipe now, so yummy!

  21. 5 stars
    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!

  22. 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.

  23. 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.

  24. 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!

4.81 from 31 votes (18 ratings without comment)

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