From the Super Mario Wiki
A Sweet Choco-bar is Dyllis's recipe found in Super Paper Mario. It fills 5 HP and cures Poison. It is made by mixing a Mild Cocoa Bean with a Honey Jar or can be bought in the Howzit's shop at Outer Space.
The Sweet Choco-bar can be given to Squirps so he can split into two and open the door to the Whoa Zone. Other kinds of chocolate bars, such as Shroom Choco-bar and Golden Choco-bar which restore more HP, also work.
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