Lunchables sells a regular pizza AND a dessert pizza, called a Treat-za. It has chocolate fudge (tastes like pudding) and colorful chocolate pieces.
A good recipe is to make some dough in the shape of a pizza and bake it. While that is happening, melt some chocolate and when the pizza is done, cover the base in chocolate. Cover the chocolate with sprinkles and put some cut up flump (Because it is cheap than a bag of marshmallows (Flump: 10p Bag of Marshmallows: £1.10))on top and your done.