Below is the recipe for Brown Sugar Buttercream.
(Makes about 4 cups)
4 large egg whites
1 cup packed light-brown sugar
1/4 teaspoon salt
1 1/2 cups (3 sticks) unsalted butter, room temperature, cut into tablespoons
- In a heatproof bowl set over (not in) a pan of simmering water, whisk together egg whites, sugar, and salt. Cook, whisking constantly, until the sugar has dissolved and the mixture is warm to the touch.
- Transfer to the clean bowl of an electric mixer. Beat on medium speed until fluffy and cooled, about 15 minutes.
- Raise speed to high; beat until stiff peaks form. Reduce speed to medium-low; add butter, 2 to 3 tablespoons at a time, until fully incorporated.