From the Super Mario Wiki
Ads keep the MarioWiki independent and free :)
In Paper Mario: The Thousand-Year Door, where it is known as a Choco Cake, it is made from Inky Sauce and Cake Mix. It can be cooked by Zess T. once the player finds Maitre Delish's Cookbook in Creepy Steeple and brings it to her. This dessert replenishes five HP and fifteen FP.
It reappears in Super Paper Mario, where it is now cooked by Dyllis. Unlike the prior installment, it is made by mixing a Mild Cocoa Bean and a Cake Mix. It restores fifteen HP and cures Poison. Despite the changes it looks almost exactly the same.
Paper Mario: The Thousand-Year Door
Super Paper Mario
Names in other languages