The WIlton Buttercream is similar to what you will find on the cakes from most bakeries. It is generally made with shortening to keep it white, and will a little almond and vanilla flavoring.
Wilton Style Buttercream
1 cup solid white shortening (or half unsalted butter) 1 1/2 teaspoons clear vanilla extract 1/4 teaspoon almond flavoring (I leave this out) 4 cups confectioner's sugar 2 tablespoons cream or half and half
Beat shortening, or shortening and butter, until light and fluffy. Add the extract and beat well.
Beat in the confectioners sugar. Add cream as needed to make the product smooth.
This can easily be made vegan by using corn syrup or soy milk in place of the cream.