Fluffy Marshmallow Buttercream Frosting
A quick and easy homemade frosting made with marshmallow fluff and butter, creating a soft, fluffy, and lightly sweet buttercream perfect for cakes and cupcakes.
- Prep Time: 10 minutes (plus 30-45 minutes to soften butter)
- Cook Time: 0 minutes
- Total Time: 40-55 minutes
- Yield: About 3 cups frosting, enough for 12-16 cupcakes or one 9-inch cake 1x
- Category: Dessert
- Cuisine: American
Ingredients
Scale
- 1 cup (227 grams) unsalted butter, softened to room temperature
- 7 ounces (198 grams) marshmallow fluff
- 2 cups (240 grams) powdered sugar, sifted
- 1 teaspoon pure vanilla extract
- 1–2 tablespoons heavy cream or milk (optional, to adjust consistency)
- Pinch of salt
Instructions
- Soften the butter by letting 1 cup (227 grams) of unsalted butter sit at room temperature until soft but not melted, about 30-45 minutes.
- Beat the softened butter on medium speed for 2-3 minutes until pale, creamy, and fluffy.
- Add 7 ounces (198 grams) of marshmallow fluff. Beat on low speed first, then increase to medium and mix until fully combined and smooth, about 2 minutes.
- Gradually add 2 cups (240 grams) of sifted powdered sugar, about ½ cup at a time, mixing on low speed to prevent dust. Increase speed to medium and beat for 3-4 minutes until fluffy and light.
- Stir in 1 teaspoon pure vanilla extract and a pinch of salt. Beat for another 30 seconds to combine.
- If frosting is too thick, add 1-2 tablespoons of heavy cream or milk, one tablespoon at a time, beating after each addition until desired consistency is reached. If too thin, add a little more powdered sugar sparingly.
- Give the frosting a final whip on medium-high speed for 1-2 minutes until light, fluffy, and holding soft peaks.
Notes
Use room temperature butter for best texture. Sift powdered sugar to avoid lumps. Avoid overbeating to prevent butter separation; chill briefly if needed. Adjust consistency with heavy cream or milk. For dairy-free, substitute vegan butter and dairy-free marshmallow fluff with almond or oat milk.
Nutrition
- Serving Size: 2 tablespoons
- Calories: 150
- Sugar: 18
- Fat: 9
- Protein: 0.2
Keywords: marshmallow buttercream, frosting recipe, easy buttercream, homemade frosting, marshmallow fluff frosting, cake frosting, cupcake frosting