put cat food into a food processor along with peanut butter and pumpkin puree.
Pulse until it resembles coarse crumbs and sticks together.
Press into a 4-inch springform mini cake pan or roll into a cake pop.
Remove from the cake pan.
Mix 1 cup powdered sugar with 2 tablespoons of water to make icing to pour over top of the cake. Spread it with a spatula and decorate with sprinkles.