Dessert & Treats Recipes Cake Recipes Fillings & Frostings Buttercream Frosting Recipes Magnolia Bakery Vanilla Buttercream 3.5 (193) Close Credit: Bryan Gardner Use this rich frosting to decorate Magnolia Bakery Vanilla Cupcakes. This recipe comes from "More from Magnolia: Recipes from the World-Famous Bakery and Allysa Torey's Home Kitchen." Directions In the bowl of an electric mixer fitted with the paddle attachment, combine butter, 4 cups sugar, milk, and vanilla. Beat on medium speed until smooth and creamy, 3 to 5 minutes. Gradually add remaining sugar, 1 cup at a time, beating for about 2 minutes after each addition, until icing reaches desired consistency; you may not need to add all the sugar. Store in an airtight container for up to 3 days.