From the Super Mario Wiki
A Heartful Cake is a recipe made by Zess T. from Paper Mario: The Thousand-Year Door. It's created by mixing either a Peachy Peach or a Cake Mix with Ruin Powder. The cake is pink with white frosting, and has a heart on top. Using it restores twenty FP, but it also lowers the user's defense for the rest of the battle.
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