This Monster Cookie Recipe is a delectable blend of chewy and thick textures, brimming with rolled oats, chocolate chips, butterscotch morsels, and more. It’s a sweet treat that promises to satisfy all your cravings! 

monster cookies next to bowls of peanut butter and M&M's

Monster cookies are a favorite dessert in our homes! In fact, we love them so much we have several different recipes including our Monster Cookie Skillet and Monster Cookie Mug Cake. Made with a wide variety of ingredients, there’s just something so irresistible about this flavor combination. Just a few of the things we love about these cookies is that they are:

  • Soft and Chewy
  • Sweet and Just a Little Savory
  • Super Versatile
  • Quick to Make 
a stack of three Monster cookies

Monster cookies got their name because they’re considered the Frankensteins of the cookie world. Containing bits and pieces of pretty much every cookie you can think of including chocolate chip cookies, peanut butter cookies, butterscotch cookies, and more!

Ingredients You’ll Need

Of course, you’ll need a few staple baking essentials like baking soda and eggs. So, be sure to double-check the full ingredient list down below. However, this monster cookie recipe also calls for a few out-of-the-ordinary items you might not consider when it comes to cookie making.  You’ll need: 

  • Chocolate Chips – Mini chocolate chips are a great option to add chocolatey flavor to each bite, but regular-sized chips work just as well. Use semi-sweet, dark chocolate, or whatever you prefer! 
  • Butterscotch Chips – You should be able to find these in your local baking section! 
  • M&Ms – We prefer mini M&M candy pieces, but regular can be used too. 
  • Unsalted Butter
  • Creamy Peanut Butter – We haven’t tested it, but if you need, you should be able to substitute peanut butter with almond or cashew butter. Just note that the flavor of your monster cookie recipe might vary slightly. 
  • Granulated Sugar
  • Brown Sugar
  • Oats
  • All-Purpose Flour
Monster cookies topped with M&M's and chocolate chips with bowls of peanut butter and M&M's in the background
  1. Preheat. To get started, preheat your oven to 350° Fahrenheit, and line your cookie sheet with parchment paper or non-stick baking mats. 
  2. Mix. In an extra large mixing bowl, combine the butter, peanut butter, and both sugars. Make sure to mix them well!
  3. Add Ingredients. Crack the eggs into the batter one at a time, scraping down the edges of the bowl in between each egg. Then, mix in the vanilla. 
  4. Add Dry Ingredient. In a separate large bowl, combine oats, flour, baking soda, and salt. 
  5. Combine. Add the oat and flour mixture to the bowl with the wet ingredients, and stir until they are just combined. Then, gently fold in the remaining ingredients. 
  6. Portion. Divide the batter into ¼ cup portions. Then, arrange them on the prepared cookie sheet 4 inches apart. 
  7. Bake. Place the cookies in the oven to bake for 8-10 minutes. Be careful not to overbake! 

Baking Tips

Un-Puff Your Cookies. These cookies don’t spread much while baking. As a result, they tend to puff up a bit as they bake. For flatter cookies, gently tap the cookie sheet on the counter while they’re still warm or use a spatula to gently push them down. In addition, you could press a few more M&Ms or chocolate chips on top! 

Prevent Flat Cookies. If your monster cookies are too flat, it’s likely one of two reasons. Either your butter was too soft, or your flour was not measured correctly. To prevent this, be sure to use chilled butter, and measure your flour with a food scale or the spoon and level method

Prevent Your Cookies from Falling Apart. Be sure to let your cookies cool completely before moving them from the baking sheet! This allows them to solidify, locking in all of the ingredients. However, if they continue to crumble, it’s probably because you added too many mix-ins and not enough binders like flour and peanut butter. 

Don’t Overbake! This monster cookie recipe will not look quite done in the oven. You don’t want your cookies to look gooey or wet, but you will need to pull them out of the oven before you think they’re completely cooked. They will continue to bake as they cool! 

a monster cookie with a bite taken out

Honestly, we can’t get these cookies to last long in our house! Yet, if you do have leftovers, they store beautifully. Keep them in an airtight container at room temperature or in the fridge for up to 5 days. 

Can I Freeze this Recipe? 

Yes, you can freeze these cookies both raw and baked for up to 6 months.  

To Freeze the Raw Dough: Roll it into bite-sized balls, and arrange them on your baking sheet. Then, place the baking sheet in the freezer until the dough is hard. Transfer the cookie balls to a sealable bag, and store them in the freezer.  

To Freeze the Baked Cookies: Once cooled, place them in an airtight container or bag, and store them in the freezer. 

When you’re ready to eat or bake, let your cookies thaw in the fridge overnight. Or, if you’re in a hurry, you can microwave the baked cooked cookies for a few seconds, or warm them in the oven for a few minutes instead! 

If you’re using the dough, bake the pre-portioned cookies directly from the freezer! 

a monster cookie with a bite taken out

Monster Cookie Recipe

5 from 3 votes
Author: Food Dolls
Servings: 20 -24 cookies
Prep: 10 minutes
Cook: 10 minutes
Total: 20 minutes
Thick, chewy, and loaded with M&Ms, chocolate, butterscotch, and more, this Monster Cookie Recipe is the perfect treat for every occasion! 


  • 1 stick unsalted butter room temperature
  • 1 ¼ cup creamy peanut butter
  • 1 cup granulated sugar
  • 3/4 cup packed light brown sugar
  • 3 large eggs room temperature
  • 1 teaspoon vanilla extract
  • 3 cups rolled oats
  • 1 ¼ cup all-purpose flour
  • 2 teaspoons baking soda
  • 1/2 teaspoon salt
  • 1/2 cup M&M’s candy
  • 1/2 cup chocolate chips
  • ½ cup butterscotch chips


  • Preheat the oven to 350 degrees Fahrenheit. Line a cookie sheet with parchment paper or non-stick baking mats.
  • In a large bowl, combine the butter, peanut butter, and sugars. Mix well.
    1 stick unsalted butter, 1 ¼ cup creamy peanut butter, 1 cup granulated sugar, 3/4 cup packed light brown sugar
  • Add 1 egg at a time, scraping the dough from the edges of the bowl in between. Add the vanilla.
    3 large eggs, 1 teaspoon vanilla extract
  • In a second large bowl, add the oats, flour, baking soda, and salt. Mix until combined.
    2 teaspoons baking soda, 3 cups rolled oats, 1 ¼ cup all-purpose flour, 1/2 teaspoon salt
  • Add the dry ingredients to the bowlwith the wet ingredients, and mix until they are just combined.
  • Fold in the M&M’s, chocolate chips, and butterscotch.
    1/2 cup chocolate chips, 1/2 cup M&M’s candy, ½ cup butterscotch chips
  • Portion the dough into 1/4th cup-sized balls, roll them, and place them 4 inches apart on the prepared cookie sheet. Gently press them down slightly, but careful not to flatten too much.
  • Bake for 8-10 minutes. Be careful not to overbake!
  • Let them stand for 3 minutes before transferring them to a wire rack to cool completely.
  • Store in large resealable plastic bags or an airtight container for up to 1 week.


The dough can easily be stored in the freezer for up to 6 months. To do so, portion out the dough, and place the mounds on a cookie sheet. Then, place them in the freezer for a few minutes to set. Once set, transfer them to an airtight container, and freeze completely.
If the dough is not portioned before freezing, it will need to be fully thawed before baking. Otherwise, it can be baked while frozen.


Serving: 1serving | Calories: 357kcal | Carbohydrates: 46g | Protein: 7g | Fat: 17g | Saturated Fat: 7g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 6g | Trans Fat: 0.2g | Cholesterol: 38mg | Sodium: 306mg | Potassium: 178mg | Fiber: 2g | Sugar: 29g | Vitamin A: 193IU | Vitamin C: 0.03mg | Calcium: 37mg | Iron: 1mg

Nutrition information is automatically calculated, so should only be used as an approximation.

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Meet Alia & Radwa

Welcome to Food Dolls! We’re so glad you found us. We are Alia and Radwa, sisters who want to share simple and easy recipes with you. We hope you find recipes here that you enjoy making as much as we do! Learn more about us!

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Recipe Rating


  1. 5 stars
    These turned out so yummy! Followed the recipe exactly and they set up perfectly. Will definitely be making again.