Cupcake "buns" waiting for assembly
To make these, I made 18 vanilla cupcakes. Once they were baked and cooled, I cut them each in half to form the "bun." The tops were a bit sticky after being stored in an airtight container overnight, and I sprinkled a tiny bit of sesame seeds over the top so they looked authentic. I also baked a batch of brownies in a rectangle pan. Using a 2" cutter, I cut out 9 brownie circles and cut each of these in half lengthwise to form the "hamburger patties."
After using a bit of frosting to adhere the lower bun to the brownie, I divided the remaining frosting into 3 bowls and dyed it green (lettuce), red (ketchup) and yellow (mustard). The frosting then got piped onto the brownie, and the rest of the vanilla cupcake was placed on top.
Box of burgers