my nephew turned 4 on the weekend- he wanted a Jupiter cake. once again, I used marshmallow fondant. I think I finally got the hang of it.
(to make a half sphere, i made a bundt cake and filled in the middle and made a dome shape with rice krispie treats. then i frosted the whole thing with chocolate and then covered it with marshmallow fondant and painted it with food colouring. The moons are rice krispie treats covered in mmf and painted with food colouring)