We teamed up with Amirah Kassem's Soho-based Flour Shop to bring you this exclusive kit. It contains all the dry ingredients you need to make the bakery's hamburger-shaped cake. Just add a few fresh ingredients to create the tender vanilla cake "bun." Use the included mix and coloring gels to whip up fluffy vanilla frosting that resembles cheese, lettuce and ketchup. For a fun finish, top the treat with the sesame seed-shaped sprinkles.

• Makes 6" diam. cake (12 servings).
• 1 lb. 15.2 oz. total.
• Just add butter, milk, eggs and cream cheese.
• A Williams Sonoma exclusive.

Kit includes:

• Vanilla Cake Mix
• Vanilla Frosting Mix
• 4 Liquid Coloring Gels (brown, green, yellow and red)
• Sprinkles
• 3 pastry tips
• 3 piping bags
• Instructions