The office had been buzzing all day with small talk about an upcoming birthday for one of our interns. She was quiet, the kind of person who always brought neat lunches and never asked for much. Somehow, I volunteered to bring a cake. On the drive home, I realized I didn’t want to just grab something from a bakery. It felt too impersonal.
That evening, my kitchen turned into a little test zone. My daughter sat at the counter flipping through her notebook, suggesting “something fluffy” for the cake topping. My husband peeked in, hoping for a taste test, as usual. I remembered a frosting I hadn’t made in years—soft, glossy, almost like marshmallows melted into a cloud.
The first batch didn’t quite hold its shape. The second one got closer, smoother, lighter. By the third try, I watched the whisk spin the mixture into thick, shiny peaks that stood tall without falling. That was the one.
The next day, when I spread it over a simple chocolate cake, it looked almost too pretty to touch. The intern smiled in that quiet way of hers, and later someone mentioned it tasted like the top of a toasted marshmallow, just softer.
That’s when I knew this frosting deserved a permanent spot in my kitchen notebook.
Short Description
This marshmallow frosting is light, glossy, and perfectly fluffy, made by whipping egg whites and sugar into a smooth base, then folding in marshmallow fluff for extra softness. It’s ideal for cakes, cupcakes, and quick desserts that need a soft, cloud-like finish.
Key Ingredients
- ½ cup white sugar
- 2 large egg whites
- ¼ cup marshmallow fluff (such as Jet-Puffed Marshmallow Creme)
- 1 teaspoon vanilla extract
Tools Needed
- Small saucepan
- Heatproof (glass or metal) mixing bowl
- Whisk
- Stand mixer or hand mixer
- Candy thermometer (recommended)
- Spatula
Cooking Instructions
Step 1: Set Up the Double Boiler
Fill a small pot with a few inches of water and bring it to a gentle simmer over medium heat. Place a heatproof bowl on top, making sure it doesn’t touch the water. This indirect heat prevents the eggs from scrambling.
Step 2: Combine Egg Whites and Sugar
Add the egg whites and sugar to the bowl. Whisk constantly while the mixture heats. After about 5 minutes, the sugar should fully dissolve. To check, rub a little between your fingers—it should feel smooth, not grainy. The mixture should reach 160°F, which makes it safe to consume.
Step 3: Whip to Stiff Peaks
Transfer the warm mixture to a stand mixer fitted with a whisk attachment. Beat on medium speed for about 5 minutes until it turns thick, glossy, and forms stiff peaks. If the peaks fall over, keep beating for another minute or two.
Step 4: Add Marshmallow Fluff and Vanilla
Add the marshmallow fluff gradually, about 1–2 teaspoons at a time, then pour in the vanilla extract. Continue beating on high speed for about 3 minutes until the frosting becomes smooth, airy, and holds firm peaks again.
Step 5: Use Immediately
Use the frosting right away while it’s fresh and fluffy. Spread it over cakes or pipe onto cupcakes. If it starts to soften, give it a quick whip to bring back structure.
Why You’ll Love This Recipe
Light and Fluffy Texture
Soft peaks give it that cloud-like feel without heaviness.
Not Overly Sweet
Balanced sweetness compared to traditional buttercream.
Simple Ingredients
Only a few pantry staples needed.
Beautiful Finish
Glossy and smooth, perfect for decorating.
Kid-Approved
Mild, marshmallow flavor that children love.
Mistakes to Avoid & Solutions
Sugar Not Fully Dissolved
Grainy frosting often comes from undissolved sugar.
Solution: Keep whisking over heat until the mixture feels completely smooth.
Eggs Cooking Instead of Heating
Too much heat can scramble the egg whites.
Solution: Use gentle simmering water and ensure the bowl doesn’t touch it.
Frosting Won’t Stiffen
This usually happens when whipping time is too short.
Solution: Beat longer until stiff peaks hold their shape.
Adding Fluff Too Quickly
Dumping it all at once can deflate the mixture.
Solution: Add gradually while mixing.
Using It Too Late
This frosting is best fresh.
Solution: Prepare it right before decorating.
Serving and Pairing Suggestions
As a Cake Frosting
- Chocolate cake
- Vanilla sponge
- Sheet cakes
Cupcake Topping
- Chocolate cupcakes
- Banana cupcakes
- Lemon cupcakes
Dessert Pairings
- Spread over brownies
- Layer in parfaits
- Top warm pies
Serving Style
- Smooth spread finish
- Swirled peaks with a spatula
- Lightly toasted with a kitchen torch
Storage and Reheating Tips
Room Temperature: Best used immediately after making
Refrigerator: Store for up to 1 day, but texture may soften
Rewhipping: Beat briefly to restore fluffiness
Avoid Freezing: Freezing breaks down the structure
FAQs
1. Can I make this frosting ahead of time?
It’s best fresh, but you can store it briefly and rewhip before using.
2. Is it safe to eat with egg whites?
Yes, heating to 160°F makes it safe.
3. Can I use a hand mixer?
Yes, just allow a bit more time to reach stiff peaks.
4. Why is my frosting runny?
It may not have been whipped long enough or got too warm.
5. Can I toast this frosting?
Yes, a quick torch gives it a toasted marshmallow flavor.
Tips & Tricks
Use room temperature egg whites for better volume
Clean, grease-free bowls help achieve stable peaks
Add a pinch of salt to balance sweetness
Chill your mixing bowl slightly in warm weather
Recipe Variations
Chocolate Marshmallow Frosting
Add 2 tablespoons cocoa powder after whipping. Mix until smooth for a light chocolate flavor.
Citrus Twist Frosting
Add 1 teaspoon lemon or orange zest with the vanilla for a fresh, bright taste.
Toasted Marshmallow Style
After frosting your cake, lightly torch the surface for a golden, toasted finish.
Final Thoughts
This frosting feels a bit special without asking for much effort, which is something I always appreciate. It’s soft, airy, and brings a gentle sweetness that doesn’t overwhelm the dessert underneath. The process itself is calming too—standing at the stove, whisk in hand, watching the texture slowly change.
That birthday cake for the intern turned out better than I expected, not because it looked perfect, but because it felt thoughtful. Sometimes a small homemade touch carries more meaning than anything store-bought.
Back in my kitchen, I’ve made this frosting a few more times, usually on evenings when I want something simple but a little elevated. My kids still ask to lick the whisk, and honestly, I let them.
It’s not the kind of recipe that demands attention, but it quietly delivers every time. And in a busy household like mine, that kind of reliability matters more than anything.
Marshmallow Frosting
Ingredients
- ½ cup white sugar
- 2 large egg whites
- ¼ cup marshmallow fluff such as Jet-Puffed Marshmallow Creme
- 1 teaspoon vanilla extract
Instructions
- Fill a small pot with a few inches of water and bring it to a gentle simmer over medium heat. Set a heatproof bowl on top, making sure it doesn’t touch the water.
- Add the egg whites and sugar to the bowl. Whisk constantly for about 5 minutes until the sugar fully dissolves and the mixture reaches 160°F. It should feel smooth, not grainy.
- Transfer the mixture to a stand mixer and beat on medium speed for about 5 minutes until thick, glossy, and stiff peaks form. If the peaks don’t hold, continue beating a bit longer.
- Gradually add the marshmallow fluff, about 1–2 teaspoons at a time, then add the vanilla extract. Beat on high speed for about 3 minutes until light, airy, and firm again.
- Use immediately while fluffy. Spread or pipe onto desserts, and rewhip briefly if it softens.
