From the Super Mario Wiki
A Heartful Cake is a recipe made by Zess T. from Paper Mario: The Thousand-Year Door. It is 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 renders the user soft for the duration of the battle, or until the status is overwritten.
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