Fluffy Marshmallow Buttercream

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I love a frosting that feels light on the tongue but still holds its shape when piped, and this Fluffy Marshmallow Buttercream does exactly that. It has that soft vanilla marshmallow flavor that instantly makes cakes, cupcakes, brownies, and even sandwich cookies feel a little more special.

What I enjoy most about this buttercream is how easy it is to work with. It pipes into beautiful swirls, spreads smoothly over layer cakes, and brings that dreamy bakery-style finish without tasting overly heavy. When I want a frosting that looks elegant but still feels playful and comforting, this is the one I reach for.

What Makes Fluffy Marshmallow Buttercream So Good?

For me, the magic of Fluffy Marshmallow Buttercream comes from the balance between richness and softness. Butter gives it structure and a classic creamy texture, while marshmallow creme brings that airy sweetness that makes every bite taste a little lighter. It is the kind of frosting that feels homemade in the best possible way, yet still looks polished enough for birthdays, holidays, and special bakes.

It is also incredibly versatile. I use it on vanilla cakes, chocolate cupcakes, cookie bars, and even as a filling between soft cookies. The flavor is sweet and nostalgic, but not flat, and the texture stays fluffy enough to make piping feel fun instead of frustrating.

Ingredients for the Fluffy Marshmallow Buttercream

Every ingredient in this Fluffy Marshmallow Buttercream has a purpose, and I always like knowing why each one matters before I start mixing.

Unsalted Butter

Butter is the foundation of the frosting. It creates the creamy body, helps the buttercream hold its shape, and gives that classic rich flavor you expect from a homemade frosting.

Marshmallow Creme

This is what gives the frosting its signature marshmallow flavor and soft, cloud-like texture. It also helps make the buttercream feel lighter and silkier than a traditional all-butter version.

Powdered Sugar

Powdered sugar sweetens the buttercream and thickens it enough for spreading and piping. I add it gradually so I can control the final texture.

Vanilla Extract

Vanilla rounds out the sweetness and deepens the marshmallow flavor. Even a small amount makes the frosting taste warmer and more complete.

Heavy Cream

A splash of heavy cream loosens the frosting just enough to make it extra fluffy. It helps create that smooth, whipped consistency that pipes beautifully.

Salt

Salt is a tiny ingredient with a big job. It balances the sweetness and keeps the frosting from tasting one-note.

How To Make the Fluffy Marshmallow Buttercream

I like to make this frosting in stages so the texture stays smooth and airy from the very beginning. It comes together quickly, but the method really helps create the fluffiest finish.

Step 1: Whip the Butter Until Pale

Add the softened butter to a large mixing bowl and beat it for several minutes until it looks pale, creamy, and noticeably fluffier. This step builds the base texture, so I do not rush it.

Step 2: Blend in the Marshmallow Creme and Vanilla

Add the marshmallow creme, vanilla extract, and salt to the whipped butter. Beat until everything is fully combined and silky. At this point, the mixture should already look light and smooth.

Step 3: Add the Powdered Sugar Slowly

Mix in the powdered sugar one cup at a time on low speed. This keeps the frosting smooth and helps avoid lumps or a sugar cloud in the kitchen. Once the sugar is incorporated, scrape down the bowl well.

Step 4: Adjust with Heavy Cream

Pour in the heavy cream a little at a time and beat again until the buttercream turns fluffy and spreadable. If I want extra definition for piping, I use less cream. If I want a softer finish for swooping over cakes, I add a touch more.

Step 5: Whip Until Light and Airy

Once everything is combined, beat the buttercream for another couple of minutes. This final whip makes the texture especially soft and gives it that pillowy marshmallow feel.

Step 6: Frost and Decorate

Use the buttercream right away on cupcakes, layer cakes, snack cakes, brownies, or cookies. It spreads easily and also pipes into tall swirls with a beautiful finish.

Best Ways to Serve and Store Fluffy Marshmallow Buttercream

I usually use this buttercream the same day I make it because that is when it is at its fluffiest and easiest to pipe. It is perfect for frosting cupcakes for parties, finishing a simple sheet cake, or adding a soft swirl to brownies and bars.

If I have leftovers, I store them in an airtight container in the refrigerator for up to 4 days. Before using it again, I let it sit at room temperature until softened, then rewhip it for a minute or two to bring back that fluffy texture. If the frosting feels too firm, a tiny splash of cream helps loosen it up beautifully.

What to Serve With Fluffy Marshmallow Buttercream?

Chocolate Cupcakes

This buttercream is absolutely wonderful on rich chocolate cupcakes. The deep cocoa flavor and sweet marshmallow frosting create a classic pairing that always disappears fast.

Vanilla Layer Cake

I love using it on a simple vanilla cake when I want something elegant but easy. The light flavor of the cake lets the marshmallow notes shine.

Brownies

A thick layer of this buttercream on fudgy brownies turns them into a dessert that tastes a little like a bakery treat and a little like a childhood favorite.

Sandwich Cookies

This frosting also works beautifully as a filling for soft sandwich cookies. It stays creamy and adds a soft, fluffy bite between the cookies.

Want More Frosting and Sweet Treat Ideas?

If you love soft, fluffy dessert finishes like this one, I think you should also check out Cool Whip and Pudding Frosting, The Best Texas Roadhouse Cinnamon Honey Butter Recipe, Easy Cheesecake Cups, and Biscoff Cheesecake. Each one brings a different kind of sweetness to the table, and they are all great inspiration when I want another easy dessert idea.

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📌 Save this Fluffy Marshmallow Buttercream to your Pinterest dessert board so you can come back to it any time.

And let me know in the comments how yours turned out. Did you keep it classic vanilla, or did you pair it with chocolate cupcakes or brownies? Did you go for smooth swoops or tall piped swirls?

I always love hearing how other bakers make these recipes their own. Questions are welcome too, and for more sweet inspiration, take a look at my daily recipe ideas on ChefAlchemy Pinterest.

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