"After frosting the cake, you will have about 1 3/4 cups of buttercream left over. It can be frozen for up to a month...."
INGREDIENTS
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2 1/4 cups sugar, divided
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1/2 cup water
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1/2 cup heavy cream
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9 large egg whites, room temperature
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6 sticks unsalted butter, softened, divided
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1 1/2 teaspoons pure vanilla extract