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silky and elegant vanilla swiss meringue buttercream
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5 from 2 votes

The Best Swiss Meringue Buttercream

Silky and elegant swiss meringue buttercream frosting that goes perfectly on top of cupcakes or cakes!
Course Dessert
Cuisine American
Keyword buttercream, cake, cupcake, frosting
Total Time 1 hour
Servings 4 cups

Ingredients

  • 3 large egg whites, room temperature 120 grams
  • ¾ cup granulated sugar less if desired
  • ¾ cup unsalted butter, room temperature 1½ sticks
  • 1 tsp vanilla extract
  • pinch of salt

Instructions

  • In a dry, grease-free, heatproof mixing bowl (or in the bowl of a stand mixer), whisk together egg whites and sugar. Set bowl over a double boiler (saucepan filled with a few inches of simmering water) over medium heat. Make sure that the bowl does not touch the water. Whisk the whites and sugar constantly until sugar is dissolved and mixture has thinned out, or until mixture reaches 160°F, about 4 minutes.
  • When the mixture is still warm, transfer to the bowl of stand mixer fitted with a whisk attachment. On high speed, beat the mixture until stiff glossy peaks form and the meringue is no longer warm to the touch, at least 10-15 minutes. If it still feels warm, wait until room temperature before adding butter.
  • On medium-high speed, add the butter 1 tablespoon at a time. Wait for the butter to fully mix in before adding the next tablespoon. After all the butter has been added, turn the mixer down to medium speed and beat until thick and creamy, around 2-4 minutes more. Finally, fully beat in the vanilla and pinch of salt, about 30 seconds.