Make layered cakes. Prepare batter following recipe directions. Bake and cool three 6 in. and three 8 in. cake layers. Prepare buttercream icing following recipe directions.
Prepare, fill and stack on cake circles 6 in. cakes for 3-layer cake, 5 in. high and 8 in. cakes for 3-layer cake, 5 in. high (trim one layer to 1 in. high). Use spatula and icing to ice cake lightly.