If Mario cooks some Cake Mix by himself, he can create a Mousse Cake. This item restores 15 HP. It appears to be a fluffy pink cake with white and pink frosting and a pink line across it.
During the events of the game, a Bub-ulb from Petalburg sends a message from Trouble Center for Mario to get two Hot Dogs and a Mousse Cake for himself. If Mario gives the requested items, the Bub-ulb will reward him with an unlimited supply of Dried Bouquets in exchange for Hot Dogs.