Monster Cookies

This Monster Cookie recipe is full of M&Ms, chocolate chips, peanut butter and oats for a cookie that is fun, chewy and delicious! Easy to make and perfect for sharing or freezing!

This Monster Cookie recipe is full of M&Ms, chocolate chips, peanut butter and oats for a cookie that is fun, chewy and delicious! Easy to make and perfect for sharing or freezing! #monstercookie #cookies #peanutbutter #oatmeal

Click HERE to save recipe to Pinterest!

Halloween is just around the corner, so I think it’s only fitting we bake up a batch of Monster Cookies.

Okay, fine, there is nothing festive about these cookies, except for the name.

Why are they called Monster Cookies?

Monster Cookies: peanut butter oatmeal cookies packed with chocolate chips and M&M'S #cookies #peanutbutter #oatmeal

Well, apparently they are called MONSTER COOKIES because they are the “frankenstein” of cookies, a complete mashup! There is great debate though about what you MUST include in order to consider them a Monster Cookie.

Frankly, I think any mashup qualifies, but others would disagree.

For today’s recipe, I started with a peanut butter oatmeal cookie dough. I added in M&M’S and chocolate chips. Personally, I would have loved to add raisins, but my kids would then develop trust issues and never touch a cookie again.

If you do like raisins in your cookies, add a cup of them into the dough! Or bake up a batch of these perfect Oatmeal Raisin Cookies instead!

How do you make Monster Cookies?

First, start by preheating your oven to 350 degrees F. Line a baking sheet with parchment paper. Set aside.

Using a large mixing bowl, combine your butter with brown sugar and granulated sugar. Cream this together until smooth. Add in peanut butter, eggs, vanilla extract (the real stuff), and blend well.

Add in your flour, quick cook oatmeal, and baking soda. Combine completely. Fold in chocolate chips and M&M’S. Feel free to use holiday colored candies, or any flavor of M&M’S are delicious too, try the pretzel or caramel for a yummy twist!

Use a 2 Tbsp scoop and bake cookies for about 12-15 minutes. You’ll get around 55-60 cookies. These freeze really well too. You can freeze the dough balls (place uncooked cookie dough balls on baking sheet in freezer for one hour, then transfer them to a ziploc bag in the freezer until ready to bake). Or freeze the cookies after baking by placing in an airtight container. ENJOY!

Monster Cookie

More Cookie ideas:

If you’re looking for HALLOWEEN themed Monster cookies, you’ve got to try these Monster sugar cookies. The recipe uses my favorite cut out sugar cookie dough and is topped with adorable themed frosting!

Another delicious Halloween treat would be this crazy fun Monster Cookie Dough Cheese Ball recipe! Don’t forget to add the silly eyeball candy to the mix, kids and adult love it!

These Monster Cookie Cheesecake Bars are super delicious. You’ll love all the layers! And all the cheesecake fans in the house rejoice!

Monster Cookie Dough Cupcakes from Wishes and Dishes are rich peanut butter cupcakes topped with a sweet and loaded cookie dough frosting packed full with peanut butter, chocolate chips and M&M candy! This is the best cupcake recipe ever!

This Monster Cookie Cake from Life Love and Sugar is full of M&Ms, chocolate chips, peanut butter and oats for a cookie cake that is fun, chewy and delicious! Easy to make and perfect for sharing!

Melt in your mouth, Raspberry Shortbread Bars with a delicious crumble on top!

Recipe for Monster Cookies: packed with peanut butter, oats, chocolate chips and candy!

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Monster Cookies recipe:

Yield: 55-60 cookies

Monster Cookies

Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes

This Monster Cookie recipe is full of M&Ms, chocolate chips, peanut butter and oats for a cookie that is fun, chewy and delicious! Easy to make and perfect for sharing or freezing!


  • 1/2 cup unsalted butter, softened
  • 1 cup granulated sugar
  • 1 cup light brown sugar, packed
  • 3/4 cup creamy peanut butter
  • 3 large eggs
  • 1 Tbsp pure vanilla extract
  • 1 cup all-purpose flour
  • 3 1/2 cups quick cook oats
  • 2 tsp baking soda
  • 1 package (11 oz) semi-sweet chocolate chips
  • 1 package (10 oz) M&M'S mini chocolate baking bits (you can use regular M&M'S candy if you prefer)


  1. Preheat oven to 350 degrees F. Line a large cookie sheet with parchment paper. Set aside.
  2. In a large mixing bowl, beat butter with sugars until creamy, about 3 minutes. Add in peanut butter and beat well.
  3. Add eggs and vanilla until well combined. Slowly add in flour, oats and baking soda, mix until blended.
  4. Fold in chocolate chips and candy pieces.
  5. Using a 2 Tbsp cookie scoop, drop cookie dough onto baking sheet. Bake for 12-15 minutes, until lightly browned on top. Remove from oven and allow to cool several minutes on pan before cooling on a wire rack.
  6. Store in airtight container for up to one week. ENJOY!


*To freeze cookie dough, drop scooped dough onto parchment paper lined baking sheet and freeze for one hour. After an hour, remove cookie doughs and place in ziploc freezer bag. When ready to bake, add several minutes to baking time. *You can also freeze the cookies AFTER baking by placing in ziploc or airtight container in freezer. To eat, thaw at room temperature and enjoy!

Nutrition Information:



Serving Size:

1 cookie

Amount Per Serving: Calories: 99Total Fat: 4gSaturated Fat: 2gTrans Fat: 0gUnsaturated Fat: 2gCholesterol: 14mgSodium: 63mgCarbohydrates: 14gFiber: 1gSugar: 8gProtein: 2g

Did you make this recipe?

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About Aimee

Aimee is a dessert lover (specifically rice krispie treats), workout enthusiast, self-taught foodie, and recipe creator.

Learn more about Aimee.

Affiliate Disclosure:**There may be affiliate links in this post! By clicking on them, or purchasing recommended items I may receive a small compensation. However, I only recommend products I love! Thank you for supporting Shugary Sweets! See my disclosure policy for more info**

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Posted on September 18, 2018

Comments & Reviews

  1. These cookies have just about everything in them but the kitchen sink! Love the base of oatmeal peanut butter cookies and the add-ons are the best! I’m with your kids – no raisins in these beauties! lol

  2. Thanks for this great recipe! When you freeze the dough, do you need to thaw them out before baking? Will I need to adjust the baking time?

  3. I love monster cookies! Great recipe — and great tip on where the name came from. I’m with your kids – my personal motto is never put a raisin where a chocolate chip could go, hehe. Can’t wait to make this one! Thanks, Aimee!

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