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! 

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!  

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I originally made this frosting to go on top of some pumpkin spice cookie bars.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. 

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. 

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.  

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!

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