This vanilla frosting is an old-fashioned cooked frosting that's easy for anyone to make. It's not as sweet as the typical powdered sugar or buttercream frostings. Use vanilla bean paste or vanilla extract to make this frosting. For a gluten-free and dairy-free version, try this vanilla frosting recipe. This recipe yields 1 cup, enough to frost one sheet cake. If you are looking to frost a layer cake, triple the recipe to ensure enough frosting for all the layers and sides of your cake.