This is a carrot cake with a cream cheese filling covered in fondant. Darth Vader, Luke Skywalker and R2D2 are made out of fondant and completely edible. This cake was a surprise for my customer's husband on his birthday. Together we came up with the top of the cake being a replication of the fight scene between Darth Vader and Luke Skywalker. The sides of the cake are airbrushed to look like the galaxy. I hope he has a wonderful birthday-- may the force be with him!
Here's some close up images of the detail on the fondant figurines: