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    Home » Recipes » Desserts

    Monster Oatmeal Cookies

    Author: Peter's Food Adventures · Published: Sep 13, 2022 · Modified: Oct 3, 2025

    Jump to Recipe

    These Monster Oatmeal Cookies are the ultimate indulgence for cookie lovers. This large batch cookie recipe is packed with hearty oats, chocolate chips, peanut butter, colorful candies, a fun twist on the classic oatmeal cookie. packed with flavor. You'll want to stock your freezer with these cookies!

    Monster cookies on a plate
    monster cookie ingredients in mixer
    mixing cookie dough

    Why You'll Love This Recipe

    • Kid Friendly and Nostalgic - the colorful candies and fun name will bring back childhood memories, creating new ones with your kids
    • Customizable - instead of Smarties, mix in M&Ms, Nuts, White Chocolate Chips or whatever is in your pantry
    • Large Batch recipe- perfect for freezing, make it once and serve and enjoy for months
    • Perfect for Any Occasion - from school lunch boxes, birthday parties, late night snacks or even taking some Skiing or Hiking

    Ingredients

    • 7 Eggs - you read that right, this is a large batch cookie recipe
    • 1 ½ cups Brown Sugar
    • 3 ½ cups White Sugar
    • 1 ½ cups Margarine or Butter
    • 2 cups Peanut Butter
    • 4 cups Flour
    • 5 cups Rolled Oats
    • 2 cups Chocolate Chips
    • 2 cups Smarties (candy coated chocolate)
    • Corn Syrup - or Golden Syrup or Honey
    • Vanilla Extract
    • Baking Powder

    Equipment

    • Mixing Bowls
    • Whisk and Spatula
    • Electric Mixer or Stand Mixer
    • Measuring Cups and Spoons
    • Baking Sheets
    • Parchment Paper
    • Ice Cream Scoop or Large Spoon
    • Cooling Rack
    mixing cookie dough with smarties
    scooping monster cookie dough

    How to Make Monster Oatmeal Cookies

    1. Preheat - warm oven to 350°F (175°C). Prepare baking sheets.
    2. Cream - using a mixer, combine eggs, brown sugar, white sugar, vanilla, softened margarine (butter), peanut butter, corn syrup until whipped evenly.
    3. Mix - using a wooden spoon, slowly add the baking soda and flour. Mix in the oats.
    4. Add Chocolates - stir through Chocolate Chips and Smarties.
    5. Shape Cookies - Drop a large scoop (about 3 tablespoons) of cookie dough onto the parchment line Baking Sheet. Optional: press a few extra Smarties on top of cookies for an nice visual appeal.
    6. Bake - place in pre-heated oven and bake for 11-13 minutes until edges are golden and centers are slightly soft.
    7. Cool - allow cookies to set for 5 minutes on Baking Sheet before removing them onto a cooling rack.
    8. Serve - enjoy warm for a gooey texture, and serve with a glass of milk.

    Monster Cookies Variations

    • White Chocolate Cranberry - replace Milk Chocolate with White Chocolate Chips, and substitute Smarties with dried Cranberries
    • Triple Chocolate - use a mix of White Chocolate, Milk Chocolate and Dark Chocolate for a decadent chocolate explosion
    • Salted Caramel - add crunch Caramel bits and sprinkle with flaky Sea Salt before baking
    • Spiced Pumpkin - perfect for Fall, add 1 teaspoon of Pumpkin Pie Spice and ½ cup of Pumpkin Puree. Reduce by 2 eggs to offset the liquids
    • Nutty Cookies - add 1 cup of of chopped Nuts like Walnuts or Pecans. This gives a great crunch when serving.
    cookies on a baking sheet
    cooling rack of cookies

    Recipe Tips and FAQs

    • Underbake Slightly - for a chewier cookie, undercook slightly when the centers look underdone - they will firm up as they cool
    • Fun Flavors - substitute Chocolate Chips with White, Toffee Chips , Peanut Butter Chips or Butterscotch Chips
    • Chill Dough (Optional) - if kitchen is warm or you want thicker cookies, chill the dough for 30 minutes. This prevents excessive spreading
    • Peanut Butter - Jif or Skippy Peanut Butter works best when baking homemade cookies. All natural peanut butter dries out the cookies.
    • Use a Stand Mixer - this is a large batch cookie recipe, so a KitchenAid mixer has enough power to beat the egg and margarine mixture until light and fluffier.
    • Smaller Cookies - use a 2 tablespoon scoop and adjust baking time to about 10 minutes - this yields more cookies, but will increase overall baking time

    Can I Make Cookie Dough Ahead of Time?

    Yes. Prepare dough and refrigerate for up to 2 days before using. Alternatively, freeze it in scoops for up to 3 months. Can bake from frozen, but need to add 1-2 minutes to baking time.

    Why Did My Cookies Spread?

    This happens when dough is too warm, butter is too soft or added too much sugar. Try chilling dough in fridge for 30 minutes before scooping and baking.

    Best Type of Oats to Use

    There are many different types of Oats in supermarkets, how do you know which one to use? Rolled Oats are the most versatile oat which I recommend for this cookie recipe. This is the Oat used in cookies, muffins, breads and more because they retain their texture when baked. They are also called Old Fashioned Rolled Oats.

    M&Ms or Smarties

    Candy coated chocolates are a key ingredient in Oatmeal Monster Cookies. Usually, they are made with classic chocolate M&M's. You could use flavored M&Ms like Peanut, Caramel or Crispy M&Ms. However, I prefer using Smarties because I like the candy coated flavor better.

    Storage

    • Room Temperature - store in an airtight container for up to 5 days
    • Freezer - place cooled cookies in a Ziploc bag and freeze. Enjoy within 3 months. This is a great option for large batch cookies
    monster cookies on a plate

    Easy Treats You'll Love

    • Puff Pastry Apple Turnovers
    • Australian Honey Joys - Cornflake Cupcakes
    • Caramel Rice Krispies
    • Birds Nest Cookies
    • Easy Spice Cookies
    • Russian Honey Cookies
    • Cinnamon Rolls
    • Sticky Toffee Pudding

    Monster Oatmeal Cookies are the perfect blend of fun, heartiness (is that a word for cookies?) sweet and unique. The perfect back-to-school cookies you can pre-make before school starts and keep in the freezer. Your family will devour these oatmeal cookies and ask for seconds. Bon Appetit! Приятного аппетита!

    Monster cookies on a plate

    Oatmeal Monster Cookies

    Bake up a batch of chewy Monster Oatmeal Cookies loaded with chocolate chips, Smarties, and hearty oats! This easy recipe uses 4 cups of flour for a big batch cookies, perfect for parties or sharing. Ready in about an hour, these customizable treats are a hit with kids and adults alike. Save this recipe for your next baking day! Perfect for freezing.
    4.95 from 35 votes
    Print Recipe Pin Recipe Rate Recipe
    Prep Time: 30 minutes minutes
    Cook Time: 45 minutes minutes
    Total Time: 1 hour hour 15 minutes minutes
    Course: Dessert
    Cuisine: American
    Keyword: monster cookies recipe, Monster Cookies with Oatmeal, Monster Oatmeal Cookies
    Servings: 50 cookies

    Equipment

    • Mixing Bowls
    • Whisk and Spatula
    • Electric Mixer or Stand Mixer
    • Measuring Cups and Spoons
    • Baking Sheets
    • Parchment Paper
    • Ice Cream Scoop or Large Spoon
    • Cooling Rack

    Ingredients

    • 7 eggs
    • 1 ½ cups brown sugar firmly packed
    • 3 ½ cups white sugar
    • 1 ½ teaspoon vanilla
    • 1 ½ cups margarine softened to room temp
    • 2 cups peanut butter
    • 1 ½ teaspoon corn syrup or golden syrup
    • 4 teaspoons baking soda
    • 4 cups flour
    • 5 cups rolled oats
    • 2 cups chocolate chips
    • 2 cups Smarties
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    Instructions

    • Preheat - warm oven to 350°F (175°C). Prepare baking sheets.
    • Cream - using a mixer, combine eggs, brown sugar, white sugar, vanilla, softened margarine (butter), peanut butter, corn syrup until whipped evenly.
    • Mix - using a wooden spoon, slowly add the baking soda and flour. Mix in the oats.
    • Add Chocolates - stir through Chocolate Chips and Smarties.
    • Shape Cookies - Drop a large scoop (about 3 tablespoons) of cookie dough onto the parchment line Baking Sheet. Optional: press a few extra Smarties on top of cookies for a nice visual appeal.
    • Bake - place in pre-heated oven and bake for 11-13 minutes until edges are golden and centers are slightly soft.
    • Cool - allow cookies to set for 5 minutes on Baking Sheet before removing them onto a cooling rack. 
    • Serve - enjoy warm for a gooey texture, and serve with a glass of milk.
    Tried this recipe?Mention @petersfoodadventures or tag #petersfoodadventures!

    ©PetersFoodAdventures.com

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