Directions

• Step 1
  Heat oven to 350°F (325°F for dark or nonstick pan). Make, bake and cool cake as directed on box for 13x9-inch pan.
• Step 2
  Cut cake crosswise in half. On serving plate, place 1 cake piece; spread top with 2 Tbsp. white frosting from 1/2 container. Top with second cake piece. Stand cake pieces on end with cut sides down. Freeze 1 hour.
• Step 3
  Stir food color into 1 container of frosting to tint light blue. Spread entire cake with light blue frosting.
• Step 4
  Along front and top of cake, mark outline of an elongated V-shape with toothpick for purse flap. Stir food color into remaining 1/2 container of frosting to tint dark blue; frost purse flap with dark blue frosting. Place remaining dark blue frosting in decorating bag fitted with writing tip #7 or #8; pipe shell border along purse flap and edges of purse.
• Step 5
  Cut rim from plastic plate; cut rim in half. Insert into top of cake for handle. Decorate purse with candies. Cut marshmallow with dampened kitchen scissors into slices; sprinkle with colored sugar. Arrange marshmallow slices on purse for clasp. Press candy onto center of clasp. Store loosely covered.