Dessert & Treats Recipes Cake Recipes Fillings & Frostings Buttercream Frosting Recipes Billy's Chocolate Buttercream Frosting 3.7 (66) Close Credit: Johnny Miller Yield: 30 cupcakes Billy Reece of Billy's Bakery, a popular New York City bakery, shared this tempting recipe that works well on a number of baked goods, with Martha—go ahead and have a taste. Directions In the bowl of an electric mixer fitted with the paddle attachment, beat butter until smooth and creamy, 2 to 3 minutes. With mixer on low speed, add chocolate until just combined. Add milk, vanilla, and sugar; mix on medium until well combined, being careful not to overmix.