1Heat oven to 350°F (325°F for dark or nonstick pans). Make, bake and cool cake as directed on box for two 9-inch rounds.
2Place each cake on serving plate. Spread 1 can pie filling on each cake to within 1/2 inch of edge. Frost sides of cakes with frosting. Spoon remaining frosting into decorating bag. Pipe frosting around top edge of each cake. Store tightly covered in refrigerator.