Dessert & Treats Recipes Cake Recipes Fillings & Frostings Buttercream Frosting Recipes Brown Sugar Buttercream 3.7 (116) 7 Reviews By Martha Stewart Editors Martha Stewart Editors Facebook Instagram Twitter Website An article attributed to "Martha Stewart Editors" indicates when several writers and editors have contributed to an article over the years. These collaborations allow us to provide you with the most accurate, up-to-date, and comprehensive information available.The Martha Stewart team aims to teach and inspire readers daily with tested-until-perfected recipes, creative DIY projects, and elevated home and entertaining ideas. They are experts in their fields who research, create, and test the best ways to help readers design the life they want. The joy is in the doing. Editorial Guidelines Updated on May 16, 2017 Print Share Share Tweet Pin Email Prep Time: 25 mins Total Time: 25 mins Yield: 4 cups Use this brown sugar buttercream on our Triple-Layer Apple Cake. If the mixture seems to have separated after all the butter is incorporated, beat on medium-high until smooth. Reduce speed to low; beat 3 minutes more. Ingredients 4 large egg whites 1 cup packed light-brown sugar ¼ teaspoon salt 1 ½ cups (3 sticks) unsalted butter, room temperature, cut into tablespoons Directions 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. Print