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Marshmallow Fluff Buttercream

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Marshmallow fluff buttercream has everything you love about American buttercream with a marshmallow twist. It tastes like a marshmallow but spreads nicely, has a great texture, works on layer cakes and is even good for piping! 

Close up of a mixer paddle filled with white marshmallow fluff frosting.

If you are looking for a fun way to give your buttercream a little something extra, you are in the right place. This marshmallow fluff frosting is perfect for all kinds of cakes and cupcakes.

It is great for decorating and the marshmallow fluff adds that bit of extra flavor that will make your taste buds sing. It is super simple to make and even easier to eat.

Frosting Love

By now I think we all know that I am a frosting fan.  I love to make the stuff and I really love to eat it!  

Ingredients for marshmallow fluff buttercream including butter, vanilla, powdered sugar, and marshmallow fluff.

I mean that is the whole point of making a cake, isn’t it?  I feel like it is hard to go wrong with deliciously plain old buttercream, but sometimes you want to amp it up a bit, am I right? 

The super light and fluffy white chocolate buttercream is an excellent example.  So is sweetened condensed milk buttercream. Both add a bit of something extra without taking away the things I love about American buttercream. 

So it makes sense that I would need to keep finding new ways to make buttercream even better. This marshmallow fluff frosting is a perfect example of that.

What Does Marshmallow Fluff Frosting Go With?

So many things! Pretty much anything you would use a vanilla buttercream on would go well with the frosting.

I originally made this frosting to go on top of some pumpkin spice cookie bars. The marshmallow was a great topper and played well with the warm tones of the bars. 

mixing bowl full of white marshmallow buttercream frosting

Recently I made a layered pink velvet cake. I filled it with blood orange curd and frosted it in a double batch of this frosting. 

It was a fun burst of childhood with the pretty color, soft cake, and fun frosting. It reminded me of a snack cake, but with epic proportions.

I decided to go with a pink ombre effect on my layer cake and I thought it turned out pretty well.  The best part is it tasted even better than it looked. 

cake with pink ombre effect on the sides and a pink swirl on the top

If you want to try this super yummy frosting, but don’t want to make a big cake, try it on copycat oatmeal creme pie bars. They taste just like the Little Debbie snack, but they are in bar form so they are super simple to make. 

In fact, I think that might be my favorite use of this frosting. There is something about the rich molasses and oatmeal cookies mixed with this yummy buttercream that is extra tasty.

They are nostalgic in the best kind of way. You should make some to see for yourself.

Frequently Asked Questions

How do you store marshmallow fluff frosting?

This buttercream can be stored at room temperature for two to three days.  Just make sure to keep it covered so it doesn’t form a crust.  

For longer storage, place in an airtight container in the refrigerator for up to two weeks or freeze for up to two months. Just bring the frosting to room temperature and whip before using.  

square of oatmeal creme pie bar on plate in front of pan of remaining bars.

What if you don’t have marshmallow fluff?

If you don’t have a jar of marshmallow fluff or marshmallow creme on hand, you can still make marshmallow frosting. Check out my recipe for marshmallow buttercream that uses melted marshmallows instead.

If you are a frosting fanatic like me, check out my Frosting 101. It goes through the different types of frosting and links to all sorts of delicious recipes!

Close up of a mixer paddle filled with white marshmallow fluff frosting.

Marshmallow Fluff Buttercream

Servings: 24 Servings
Author: Carlee
Marshmallow fluff frosting is perfect for cakes, cookies, and more. It reminds me of the filling of our favorite snack cakes. Make a double batch to frost a layered cake, or use written for a 9×13-inch cake. We love it on oatmeal cream pie bars, or it would be amazing as a filling for whoopie pies.
4.61 from 63 ratings
Prep Time 8 minutes
Cook Time 0 minutes
Total Time 8 minutes


  • 1 cup butter softened
  • 2 cups powdered sugar
  • 1 tsp vanilla extract
  • 7 oz marshmallow fluff


  • In your mixer bowl, cream the butter until it is light and fluffy.  (Go ahead and let it go for a minimum of 2 minutes.)
    1 cup butter
  • Add in the powdered sugar, vanilla extract, and marshmallow fluff and mix on low until incorporated. Turn the mixer to medium speed and beat for about 4 minutes.
    2 cups powdered sugar, 1 tsp vanilla extract, 7 oz marshmallow fluff
  • Spread on your cooled dessert or store in an airtight container until ready to use.



Serving: 1ServingCalories: 130kcalCarbohydrates: 16gFat: 8gSaturated Fat: 5gPolyunsaturated Fat: 2gCholesterol: 20mgSodium: 68mgSugar: 14g

Nutritional Disclaimer

“Cooking With Carlee” is not a dietitian or nutritionist, and any nutritional information shared is an estimate. If calorie count and other nutritional values are important to you, we recommend running the ingredients through whichever online nutritional calculator you prefer. Calories and other nutritional values can vary quite a bit depending on which brands were used.

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Recipe Rating


Saturday 2nd of March 2024

Hi Carlee- new sub just today in fact. I'm going to use your marshmallow fluff vanilla buttercream for my Macron filling!! I'll let you know how it goes! Carlee, can you add cocoa powder or chocolate ganache to the frosting to make it fudgy? What is your thoughts...??? Thanks so much! And much love and happy bakes from Idaho! Cheryl


Sunday 3rd of March 2024

Welcome to the family! Either a little bit of cocoa powder or melted chocolate would be great in the buttercream. I would start with a couple of Tablespoons of either and keep adding it until you get your desired color/flavor.

Darlene Angarola

Saturday 28th of October 2023

Hi! Trying to make the years old Marshall Fields Mace coffee cake with the gooey filling! Round 2 layer with sugar glazed top Help?


Saturday 28th of October 2023

That sounds delicious. I don't have the recipe, but I will keep my eye out.


Sunday 28th of May 2023

Have you toasted this frosting like a meringue?


Sunday 28th of May 2023

I have not. Now I'm curious how that would go.

Jennifer Ragonese

Thursday 5th of January 2023

This is almost the same recipe as the one I use for my Whoopie pie filling - just add a little more icing sugar and vanilla - it's one of the most requested fillings for my Whoopies and I'm sure it would be so yummy on cakes or as a filling for a tiered cake.


Friday 6th of January 2023

It would make a great whoopie pie filling! We really like it on oatmeal cream pie bars and in cookie sandwiches as well.


Wednesday 1st of September 2021

Been making this for years! Try add about a 1/2 cup peanut butter for a fluffernutter frosting! Its delish!


Wednesday 1st of September 2021

Now that sounds delicious!