Candy-Frosted Cake

Heat oven to 350. Prepare and bake 1 pkg. Betty Crocker Supermoist Yellow Cake Mix in rectangular pan, 13x9x2", as directed. Cool completely. Frost with 1 tub Betty Crocker Creamy Deluxe Ready-to- Spread Frosting. Arrange 1 package (12 oz.) M&M's plain chocolate candies on top for decoration.