Directions

1. Prepare tiers: Trim layers. On corresponding- size boards, fill 6-, 9-, 12-, and 15-inch layers with frosting to make 4-inch-high tiers. Repeat with 4-inch layers to make a 3-inch-high tier. Frost tiers; press a large offset spatula vertically against sides at 1-inch intervals to make swooping ridges.
2. Assemble tiers: Place 15-inch tier on board. Insert 10 dowels, arranging 1 in center and 9 in a circle 2 1/2 inches from edge. Center and place 12-inch tier on top; insert 8 dowels in a circle 2 1/2 inches from edge. Center and place 9-inch tier on top; insert 4 dowels in a square 2 1/2 inches from edge. Center and place 6-inch tier on top; insert last 3 dowels in a triangle 2 inches from edge. Refrigerate until ready to display. Decorate with gum-paste magnolias.