Vegan Superhero Cake and cupcakes. The clients son has a very serious milk, egg and nut allergy so every precaution was taken to ensure all aspects of the cake and decorations were edible for him. The cake is four layers of alternating vanilla and chocolate with buttercream frosting. The cupcakes are made with real strawberries with buttercream frosting. All aspects of the cake and cupcakes are vegan.