Oatmeal Whoopie Pies (with m&ms!)

These M&M monster oatmeal whoopie pies are a great way to use up any leftover candy. Or, make these for family fun nights and birthday parties! A dollop of smooth icing is sandwiched between each soft-baked oatmeal monster cookie for added delectability!

whoopie monster cookies with cream cheese filling and vibrant sprinkles

Why you’ll love this recipe: 

These monster oatmeal sandwiches have the perfect blend of vanilla, brown sugar and colorful m&ms. Top them off with vibrant sprinkles for the ultimate party cookie.

ingredients for oatmeal monster cookie sandwiches
colorful and creative whoopies

Ingredients for oatmeal monster sandwiches

  • Butter– room temperature is best
  • Granulated Sugar
  • Light brown sugar 
  • Egg 
  • Vanilla extract– only real vanilla extract is recommended
  • All-purpose flour
  • Rolled Oats
  • Baking soda
  • Salt
  • M&m’s- use a variety of colors or customize for a special occasion
  • Sprinkles

For the frosting

  • Butter
  • Powdered sugar– if you prefer cream cheese frosting, try this recipe
  • Heavy Cream

Step 1: Make the monster cookies

mix wet ingredients
mix wet ingredients
mix dry ingredients
mix dry ingredients
combine ingredients
combine with m&m’s and sprinkles
placing cookies on baking sheet
place 2 inches apart on baking sheet
frost with a piping bag
remove and frost
  1. Preheat the oven and line a baking tray with parchment paper.
  2. Mix wet ingredients.
  3. Take another bowl and mix the dry ingredients: flour, oats, salt, and baking soda and keep aside. Combine and add in the M&ms and sprinkles and mix it well. 
  4. Place scoops on a baking tray keeping at least two inches apart. Press m&m’s into the top to make them stand out. Bake.
  5. Cool.
frosting ingredients with mixer
frosting ingredients
cookie frosting ingredients with mixer
combine
frosting each cookie
use a piping bag to frost

Step 2: Mix the frosting

  1. Beat ingredients and add to a piping bag, then flip a cookie and add the frosting.
  2. With the help of a spatula, place another cookie on top.
full glass of milk with oatmeal whoopie pie monster cookie sandwiches
milk + monster cookies make a great pair

What to serve with cookie sandwiches 

Serve these delicious cookies with a tall glass of milk or ice cream.

You can even customize the center filling with your favorite ice cream flavors!

hand grabbing a thick oatmeal whoopie pie monster cookie full of sprinkles and m&m's
bright and colorful party cookies

FAQ

Can I freeze these for later? 

Yes! Freeze individually then place all cookies in a zippered, airtight bag in the freezer for up to three months. To thaw, place in the refrigerator overnight. 

What to do with leftover cookies? 

Leftover cookies may be stored in an airtight container for up to 3 to 5 days. To extend the shelf life, baked cookies may be stored in the refrigerator in a zippered bag for up to 7 to 8 days.

half eaten oatmeal whoopie pie cookie showing the inside with frosting next to a tall glass of milk

Recipe Tips

  • Use an ice cream scoop for the perfect amount of dough
  • Allow cookies time to cool before frosting (it will melt if frosted too soon)
  • You can add nuts, raisins, and/or choco chips to add an extra layer of flavor.
  • Oats add texture to these cookies and make them a bit chunky.
  • These cookies are soft and chewy.
oatmeal m&m whoopie pie cookies with bright pink and blue sprinkles sandwiched with cream cheese filling

Oatmeal Whoopie Pies (with m&ms!)

M&M oatmeal whoopie pies are the best way to use up any leftover holiday M&M candy! The perfect cookie for kiddos, parties, and potlucks!
5 from 2 votes
Prep Time 20 mins
Cook Time 18 mins
Total Time 38 mins
Course Dessert
Cuisine American
Servings 16
Calories 173 kcal

Equipment

  • mixer

Ingredients
  

For the Cookies

  • ½ cup butter room temperature
  • ½ cup granulated sugar
  • ½ cup light brown sugar
  • 1 egg
  • 1 tbsp vanilla extract
  • 1 cup all-purpose flour
  • 1 cup rolled oats
  • ½ tsp baking soda
  • ½ tsp salt
  • ¼ cup m&ms
  • ¼ cup sprinkles

For the Frosting

  • ½ cup butter room temperature
  • 1 cup powdered sugar
  • 1 tbsp heavy cream

Instructions
 

Cookie Instructions

  • Preheat the oven to 180 C / 350 F and line your baking tray with parchment paper.
  • Take the butter in a large bowl and microwave it for 10 seconds. Add both the sugar to this and beat on medium speed (using an electric beater) till everything is combined well for 2-3 mins.
  • Now add in the egg and vanilla extract and mix till it's incorporated well.
  • Take another bowl and mix the dry ingredients: flour, oats, salt, and baking soda and keep aside. 
  • Now add dry mixture to the butter mixture and mix till the dry ingredients are incorporated well. Add in the M&ms and sprinkles and mix it well. (No need to chill, can be used right away)
  • Scoop the dough with an ice cream scoop, and place them on the baking tray keeping at least two inches distance between each scoop. Bake for 15- 18 mins.
  • Once baked, cool them completely before frosting.

Frosting Instructions

  • Take a large bowl, add in the softened butter and beat on medium speed till it's creamy. Now add in the powdered sugar in batches along with the heavy cream and beat till it's light and creamy.
  • For assembling the cookie you can either use a piping bag to pour frosting as per your liking or simply layer one side of the cookie with the help of a spatula and place another cookie on top.

Notes

Notes –
  • You can add nuts, raisins, and/or chocolate chips to add an extra layer of flavor.
  • Oats add texture to these cookies and make them a bit chunky.
  • These cookies are soft and chewy.
Storage
  • store in a sealed container up to 5 days at room temperature.
  • freeze for up to 3 months in a sealed, air-tight freezer bag. Defrost overnight in fridge to enjoy.

Nutrition

Calories: 173kcalCarbohydrates: 35gProtein: 2gFat: 2gSaturated Fat: 1gPolyunsaturated Fat: 1gMonounsaturated Fat: 1gTrans Fat: 1gCholesterol: 14mgSodium: 132mgPotassium: 62mgFiber: 1gSugar: 25gVitamin A: 61IUVitamin C: 1mgCalcium: 33mgIron: 1mg
Keyword m&m whoopies, monster cookies, oatmeal monster cookies, whoopie cookies
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