4.75 from 20 reviews

Peanut Butter Monster Cookies

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peanut butter cookies made with m&ms and chocolate

Giant Peanut Butter Monster Cookies. It honestly doesn’t get any better than this!

If you’re a fan of thick, gooey, chocolate-filled cookies you’re not going to want to put this cookie down. Believe me!

After making these peanut butter chip cookies and peanut butter cup cookies I knew I had to whip up another epic cookie recipe.

But truthfully, what’s not to love about peanut butter & chocolate together in cookie form?!

If you’re looking for a cookie with unbeatable taste, and a little sweet and salty in each bite you won’t want to miss out on making these!

cookies filled with peanuts, m&ms and chocolate

These cookies are:

  • Ultra thick
  • Exceptionally soft
  • Filled with mini M&Ms and chocolate chips
  • Packed with oatmeal & creamy peanut butter
  • Easy to make & require no chill time
  • Freezer-friendly

Ingredient Notes

These cookies have the usual cookie ingredients like butter, brown sugar, baking powder, All-Purpose flour, eggs, baking soda and salt. There are a few ingredients I add that set these apart.

ingredients to make cookies in small glass bowls
  • Mini M&Ms: I love using the mini M&Ms because you get more chocolate in each bite, but you can use any M&Ms you prefer. 😍
  • Chocolate Chips: Semi sweet or dark chocolate is what we love.
  • Quick oats: the quick oats give the cookie an overall better texture than the old fashioned oats.
  • Creamy Peanut Butter: I love using a smooth, creamy peanut butter (like Jif or Skippy) as opposed to a natural peanut butter. Natural peanut butter tends to dry out the cookie.
  • Peanuts: extra chunks of peanuts help make these cookies extra pea-nutty and delicious!
  • Cake flour: is finer, softer and lighter than All-Purpose Flour and I find using a mix of both cake flour and All-Purpose results in the perfect cookie. You can find cake flour in most grocery stores, usually on the top shelf. If you don’t have cake flour you can still make these cookies, just replace it with All-Purpose flour.
  • Corn Starch: Cornstarch is key to giving cookies that delectably soft center that’s just to die for. It also helps to keep the cookies thick and GIANT!
  • Adding an extra Egg Yolk: Another way to promise a super chewy cookie is to use an extra egg yolk! The extra egg yolk adds richness, soft tenderness, and binds the dough.

Step by Step Directions

Like most of my cookie recipes, these cookies are big! This recipe make 6 HUGE cookies, but you can always make them smaller. 🙂

cookie dough on a baking sheet with salt on top
  1. Mix dry ingredients together in a large bowl: all-purpose flour, cake flour, cornstarch, baking soda, baking powder and salt. Set aside.
  2. Cream butter and sugars until light and fluffy.
  3. Then add in the peanut butter, eggs and vanilla. (In that order)
  4. Gradually add in the dry ingredients.
  5. Lastly, add in the quick oats, M&Ms, chocolate chips and chopped peanuts. Mix just until combined.
  6. Roll cookie dough into a large dough ball & top with flaky sea salt (We love Maldon).
  7. Place cookies on an ungreased cookie sheet and flatten each cookie just a little.
  8. Bake 10-12 min. Transfer to a wire rack to cool.
cookie dough balls on a baking sheet

Tips and Variations

  • Let the cookies rest: If your cookies are turning out too gooey, let them rest longer. I recommend at least 15 minutes on the cookie sheet and then transfer to a cooling rack to cool completely. They are even better if you let them sit and enjoy the next day. Your cookies aren’t ruined, just let them rest!
  • Use any M&Ms size or variety you love!
  • Stir in 1/2 cup chopped pretzels if you’re looking for even more of a salty/sweet flavor combination.
  • You can make the cookies smaller. Adjust baking time as needed.
  • You can make homemade cake flour if you can’t find it in stores. Homemade cake flour: 14 Tbsp. All-purpose flour and 2 Tbsp. corn starch. Mix these together and sift them twice to get them fully mixed and aerated. This will make ~1 cup flour. You only need 3/4 cup for this recipe.
  • Gluten free option: Replace both the All-Purpose flour and Cake flour with: Bob’s Red Mill Gluten Free 1-to-1 Baking Flour 
a womans hand holding a peanut butter monster cookie


What if I don’t have a stand mixer?

Using a hand mixer will work just fine!

Why are my cookies flat?

Your cookies may need a little more flour. Try adding in a few extra tablespoons to see if that fixes the issue. Also, are you baking your cookies on a greased cookie sheet? Sometimes that causes cookies to spread. Try using a Silpat mat or parchment paper instead.

Can I freeze these cookies once baked and cooled?

Yes. Cookies can be frozen for up to 3 months.

How long do these cookies last?

Stored properly in an air-tight container at room temperature they will last for up to 5 days. I don’t recommend storing in the refrigerator because they will go stale much faster and lose their quality quickly.

When it comes to cookie texture, which one wins your heart?

Before You Begin! If you make this, please leave a review and rating letting us know how you liked this recipe! This helps our business thrive & continue providing free recipes.

an up close photo of the inside of a peanut butter monster cookie
4.75 from 20 reviews

Peanut Butter Monster Cookies

Prep: 10 minutes
Cooling time: 15 minutes
Cook: 12 minutes
Total: 37 minutes
Servings: 6 large cookies
These Peanut Butter Monster Cookies are just as extreme as they sound! Packed with mini M&Ms, chocolate chips, chopped peanuts, quick oats and creamy smooth peanut butter. It's a lot, but in the best way possible!


  • 1 cup All-Purpose Flour
  • 1 cup Cake Flour
  • 1 tsp. cornstarch
  • 1/2 tsp. baking soda
  • 1/2 tsp. baking powder
  • 1/2 tsp. salt
  • 8 Tbsp. unsalted butter, cold, cut into cubes
  • 1/2 cup brown sugar, packed
  • 1/4 cup granulated sugar
  • 3/4 cup creamy peanut butter
  • 1 large egg
  • 1 large egg yolk
  • 1 tsp. vanilla extract (but I always add a liiiittle extra)
  • 1/2 cup mini M&Ms
  • 1/2 cup chocolate chips, semi-sweet
  • 1/2 heaping cup quick oats
  • 1/2 cup chopped peanuts
  • 1 Tbsp. Flaky sea salt (for sprinkling on top of cookies)

Last step! If you make this, please leave a review and rating letting us know how you liked this recipe! This helps our business thrive & continue providing free recipes.


  • Preheat the oven to 400°F.
  • Whisk together the dry ingredients in a large bowl: All-Purpose flour, cake flour, corn starch, baking soda, baking powder and salt. Set aside.
  • Using a stand mixer fitted with the paddle attachment, cream together the butter and sugars until light and fluffy, about 3-4 minutes.
  • Add in the creamy peanut butter, then add in the egg, egg yolk and vanilla extract. (In that order).
  • Gradually add in the dry ingredients followed by the M&Ms, chocolate chips, quick oats and chopped peanuts. Mix just until combined. Turn off the machine.
  • Form the dough into 6 large dough balls and place on a cookie sheet. You can use a silicone baking mat or parchment paper if you prefer.
  • Flatten each dough ball slightly with your fingers, and sprinkle a little flaky sea salt on top of each cookie and a couple mini M&Ms, if you're feeling extra.
  • Bake for 10-12 minutes, or until tops of cookies are golden brown. Ovens may vary. Top with more chocolate chips when they come out of the oven, if desired.
  • Cool on the baking sheet for 15 minutes then transfer to a cooling rack to cool completely.*



  • Let the cookies rest: If your cookies are turning out too gooey, let them rest longer. They are even better if you let them sit and enjoy the next day. Your cookies aren’t ruined, just let them rest!
  • I love using the mini M&Ms because you get more chocolate in each bite, but you can use any M&Ms you prefer.
  • Make the cookies smaller, and adjust baking time as needed.

Nutrition Information

Serving: 1large, Calories: 840kcal (42%), Carbohydrates: 89g (30%), Protein: 19g (38%), Fat: 48g (74%), Saturated Fat: 20g (125%), Polyunsaturated Fat: 8g, Monounsaturated Fat: 15g, Trans Fat: 1g, Cholesterol: 109mg (36%), Sodium: 648mg (28%), Potassium: 387mg (11%), Fiber: 5g (21%), Sugar: 49g (54%), Vitamin A: 651IU (13%), Vitamin C: 1mg (1%), Calcium: 123mg (12%), Iron: 3mg (17%)

Nutritional information is provided as a courtesy and is automatically calculated. It should only be construed as an estimate rather than a guarantee. Ingredients can vary and Kroll’s Korner can’t make any guarantees to the accuracy of this information.

Krolls Korner

Krolls Korner

Welcome to my tiny “korner” on the Internet! I am a Registered Dietitian Nutritionist who loves cookies as much as kale. (OK, maybe I like cookies a little bit more but shh, don’t tell anyone). I am so glad you’re here! Follow along for hassle free, realistic and approachable recipes.

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I made a double batch of these this weekend (red, white and blue M&M’s) in preparation for a July 4th party at my daughter’s workplace. They came out great and my wife said it’s one of her favorite cookies that I’ve ever made. My only challenge was that the dough came out very very crumbly. When we formed the cookie balls, we had to squeeze to get them to hold together, and they did…but I was worried. Not sure what I did wrong, as I followed the ingredients and I actually weigh everything to ensure accuracy. I also topped them with coarse sea salt and that is a game changer. At each bite you get the sweetness of the cookie followed by a hint of saltiness….AMAZING! My daughter’s text just reported that these were the number one pick of all the items I sent in.

Vicki Skonieczny

These cookies are INSANE!!!! I have never made cookies this large and had them bake up so beautifully. Flavors and textures hit all the right spots….salty, sweet, soft and chewy all at the same time. I am making three more batches this weekend. I would give this recipe more than 5* if I could. Thanks for sharing such a wonderful recipe!

Sara Welch

Whipped up a batch of these this afternoon and they do not disappoint! Perfectly moist, delicious and easy; exactly what I needed to cure my sweet tooth!


Oh how fun! These cookies are packed with all my kids’ favorite things. They would have such a great time making these in the kitchen.


My boys will love this. Can’t wait to make these cookies. Thanks for sharing.


Oh my goodness, my kids will love these – so loaded up with goodies, and fun looking too

Jacqueline Meldrum

Those are hummungous but totally amazing! Drooling here.