There is nothing quite like the cloud-like texture of a perfect Marshmallow Buttercream Frosting. Whether you are piping a tall, voluminous swirl onto a golden brown cupcake or filling a layered cake, this recipe delivers a dense yet airy consistency that holds its shape beautifully. Unlike a traditional powdered sugar frosting, the addition of marshmallow fluff creates a semi-glossy, smooth finish that looks professional and tastes nostalgic. If you’ve been searching for that thick white frosting that doesn’t melt under pressure, this is the one for your kitchen repertoire.
Why This Is The Best Marshmallow Buttercream Frosting You Will Ever Make
- Unbeatable Stability: This frosting is specifically engineered to hold a tall, piped swirl without drooping, making it perfect for high-impact dessert displays.
- Professional Texture: We achieve a smooth, semi-glossy finish with soft, rounded peaks that look like they came straight from a high-end bakery.
- Perfect Balance: The salt and vanilla cut through the sweetness of the marshmallow fluff, ensuring a rich flavor that isn’t cloying.
- Pinterest-Ready Visuals: When piped onto a golden cupcake base with white paper liners, it creates a classic, clean aesthetic that stops the scroll.
The Science of Fluff: Essential Ingredients
Creating a Marshmallow Buttercream Frosting that is both light and stable requires high-quality ingredients at the correct temperatures. Here is what you will need:
1. Unsalted Butter
You will need 1 cup (227g) of high-quality unsalted butter. It must be softened to room temperature—around 65°F (18°C). If the butter is too cold, the frosting will be lumpy; if it’s too warm, it won’t hold those signature tall swirls.
2. Marshmallow Fluff (Marshmallow Crème)
One jar (7 oz / 198g) of marshmallow fluff is the secret to the airy, “stretchy” texture. This provides the semi-glossy look and the distinct marshmallow flavor that sets this recipe apart from standard buttercreams.
3. Powdered Sugar (Confectioners’ Sugar)
We use 3 to 4 cups (375g – 500g) of sifted powdered sugar. Sifting is non-negotiable here; it ensures the Marshmallow Buttercream Frosting remains perfectly smooth without any gritty sugar pockets. This ingredient provides the structural “skeleton” for your piping.
4. Heavy Cream or Whole Milk
You’ll need 1-2 tablespoons (15-30ml) of heavy cream. This acts as a lubricant to create that dense, airy consistency seen in professional neapolitan cake recipes. It allows the whisk to incorporate air more effectively.
5. Pure Vanilla Extract & Fine Sea Salt
Use 1 teaspoon (5ml) of vanilla and a pinch of fine sea salt. The salt is a critical “invisible” ingredient that balances the high sugar content of the marshmallow fluff.
6. The Garnish: Mini Marshmallows
To match our visual blueprint, have a handful of mini white marshmallows ready. Pressing three tiny, matte white mini-marshmallows into the side of the frosting swirl adds a whimsical, artisanal touch.
How To Make Marshmallow Buttercream Frosting: Step-By-Step
Step 1: The Creaming Phase
In the bowl of a stand mixer fitted with the paddle attachment, beat the 1 cup (227g) of softened butter on medium-high speed for a full 3-5 minutes. You are looking for the butter to turn almost white in color and become incredibly light and pale. This is the foundation of our Marshmallow Buttercream Frosting.
Step 2: Incorporating the Fluff
Switch to the whisk attachment. Add the 7 oz (198g) jar of marshmallow fluff. Mix on medium speed until the butter and fluff are completely homogenous. At this stage, the mixture should look glossy and slightly elastic.
Step 3: The Slow Sugar Integration
Turn the mixer to the lowest setting. Gradually add the sifted powdered sugar, one cup at a time. This prevents a “sugar cloud” from escaping the bowl and ensures the Marshmallow Buttercream Frosting remains dense rather than grainy. If you like experimenting with textures, this frosting also pairs beautifully as a topping for peach cobbler cheesecake donuts.
Step 4: The High-Speed Volume Whip
Once the sugar is incorporated, add the vanilla, salt, and 1 tablespoon (15ml) of heavy cream. Turn the mixer to high and whip for 2 minutes. Watch for the transformation: the frosting will grow in volume and develop soft, rounded peaks. If it feels too stiff, add the second tablespoon of cream.
Step 5: Removing Air Bubbles
Before piping, take a rubber spatula and manually stir the frosting for 1 minute, pressing it against the sides of the bowl. This removes large air pockets, ensuring your tall swirl is perfectly smooth and free of “blowouts” when piping.
Styling the Perfect Marshmallow Cupcake
To achieve the look of our Marshmallow Buttercream Frosting visual blueprint, follow these styling cues:
The Pipe: Use a large round tip or a large star tip. Start in the center of a golden brown cupcake (housed in a white paper liner), move to the edge, and spiral upward in a continuous motion to create a tall, voluminous swirl.
The Garnish: Immediately after piping, while the frosting is still tacky, press three mini white marshmallows into the side of the swirl. This creates a beautiful contrast between the semi-glossy frosting and the matte marshmallows.
Expert Tips for Success
- Sift Twice: If your powdered sugar is particularly clumpy, sift it twice. A smooth texture is the hallmark of a great Marshmallow Buttercream Frosting.
- Temperature Control: If your kitchen is hot, your frosting will lose its “tall swirl” capability. Chill the mixing bowl for 10 minutes before starting if necessary.
- Storage Hack: This frosting can be made in advance. It stores well in the fridge, but you must let it come back to room temperature and re-whip it before piping.
- Pairing Suggestions: While great on cupcakes, try using leftovers as a dip for a banana pudding fluff salad for a decadent treat.
Storage, Reheating & Freezing
Storage: Place the frosting in an airtight container in the refrigerator for up to 1 week. Because of the butter content, it will firm up significantly when cold.
Freezing: You can freeze Marshmallow Buttercream Frosting for up to 3 months. Thaw overnight in the refrigerator and bring to room temperature before re-whipping to restore the airy consistency.
What To Serve With This Frosting
This frosting is incredibly versatile. While it shines on vanilla or chocolate cupcakes, it is also a fantastic topping for graham cracker cookies or as a filling for whoopie pies. If you’re hosting a full meal, this sweet finish perfectly follows savory dishes like crack burgers or a light summer salad.
Frequently Asked Questions
It is not recommended. Melted marshmallows change the structure and can lead to a sticky, lumpy frosting. Marshmallow fluff is specifically formulated to stay smooth and incorporate air.
The key is using a large piping tip (like a Wilton 2A or 1M) and applying consistent pressure while spiraling upward, ensuring the frosting is at room temperature for the best flow.
Use a clear vanilla extract and whip the butter for at least 5 minutes before adding other ingredients to whiten the base naturally.
This is a non-crusting frosting. It stays soft and semi-glossy on the outside, which is why it looks so fresh and professional on Pinterest-style cupcakes.
While it is more stable than whipped cream, the butter base will soften in extreme heat. For outdoor events, keep the cupcakes chilled until 30 minutes before serving to maintain those tall swirls.
The Final Marshmallow Buttercream Frosting Recipe
Marshmallow Buttercream Frosting: The Ultimate Fluffy Swirl Recipe
Ingredients
Equipment
Method
- Beat softened butter on medium-high speed for 3-5 minutes until pale and fluffy.
- Switch to a whisk attachment and incorporate marshmallow fluff until smooth and semi-glossy.
- Gradually add sifted powdered sugar on low speed until combined.
- Add vanilla, salt, and cream. Whip on high speed for 2 minutes until dense and airy with soft peaks.
- Pipe tall swirls onto cupcakes and press three mini marshmallows into the side of the frosting.
Notes
Always sift sugar twice to avoid any lumps in your piping tip.
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