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A spatula spreading smooth, homemade strawberry marshmallow frosting onto a vanilla cupcake.

Strawberry Marshmallow Frosting (Light, Fluffy & So Easy!)

Whip up this light, fluffy, and incredibly delicious Strawberry Marshmallow Frosting! Made with real strawberries and marshmallow fluff, it's the perfect stable, flavorful topping for cakes, cupcakes, and more. An easy recipe for a show-stopping dessert.
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Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Servings: 3 cups
Course: Dessert
Cuisine: American
Calories: 150
Ingredients Equipment Method Notes

Ingredients
  

Strawberry Reduction
  • 1 cup diced strawberries fresh or frozen
  • 2 tbsp granulated sugar
  • 1 tsp lemon juice
Frosting
  • 1 cup unsalted butter softened
  • 7 oz marshmallow fluff one standard jar
  • 3 cups powdered sugar sifted
  • 1 tsp vanilla extract
  • 1/4 tsp salt

Equipment

  • 1 Stand mixer or hand mixer
  • 1 Small Saucepan
  • 1 Fine-Mesh Sieve

Method
 

  1. Combine strawberries, granulated sugar, and lemon juice in a small saucepan over medium heat. Cook, stirring occasionally, until strawberries break down and the sauce thickens (about 10-15 minutes). Strain through a fine-mesh sieve to remove seeds. Let it cool completely.
  2. In a large bowl, beat the softened butter with a mixer on medium-high speed for 3-5 minutes until pale, light, and fluffy.
  3. Add the marshmallow fluff, vanilla, and salt. Mix until combined. On low speed, gradually add the sifted powdered sugar until fully incorporated.
  4. Increase speed to medium-high and beat for 2-3 minutes until very light and fluffy. Add 3-4 tablespoons of the cooled strawberry reduction and mix until just combined.
  5. Use immediately to frost cakes or cupcakes, or store in an airtight container in the refrigerator for up to a week.

Notes

Ensure the strawberry reduction is completely cool before adding it to the butter mixture to prevent melting.
For a stronger strawberry flavor, add an extra tablespoon of the reduction.
If the frosting is too soft, you can chill it for 15-20 minutes to help it firm up.