Make layered cakes. Prepare batter following recipe directions. Bake and cool two 8 in. cake layers and two 6 in. cake layers. Prepare buttercream icing following recipe directions. Level, fill and stack 8 in. layers for a 2-layer cake, 6 in. high, and 6 in. layers for a 2-layer cake, 4 in. high on same size cake circles. Use spatula and buttercream icing to ice cakes smooth.