Marshmallow Vanilla Buttercream Frosting

  • Author: Jo-Anna Rooney
  • Prep Time: 20 minutes
  • Total Time: 20 minutes
  • Yield: 3 cups 1x


This Marshmallow Vanilla Buttercream Frosting is the perfect icing for either chocolate or vanilla cupcakes!  Will ice 12 Р16 cupcakes (thickly), or 24 cupcakes if spread more thin.



  • 3/4 cup unsalted butter
  • 2 cups icing sugar (confectioners sugar)
  • 13 tsp heavy cream
  • 1 tsp vanilla
  • 1198 g container of Marshmallow fluff
  • salt to taste (optional)


  1. Sift the icing sugar (confectioners sugar). Set aside.
  2. In a mixer, beat the butter until soft and fluffy. You’ll have to scrape the sides of the bowl several times. This process of getting fluffy butter takes at least 10 minutes.
  3. Add the sifted icing sugar, and mix until smooth.
  4. Add the vanilla and heavy cream and beat until smooth.
  5. Beat in the marshmallow fluff until smooth.
  6. Decorate your cupcakes and enjoy!


I used a Wilton 1M icing tip for the icing roses.

Keywords: buttercream, marshmallow icing, marshmallow frosting, marshmallow buttercream