From the Super Mario Wiki
A Golden Choco-bar is a recipe found in Super Paper Mario made by Dyllis. It has nuts and nougat inside. It fills 25 HP and cures Poison. It comes with a golden wrapper. It's made by mixing a Mild Cocoa Bean with a Golden Leaf, or can be bought in Howzit's shop at Outer Space.
Squirps wanted chocolate so he could split into two and open the door to the Whoa Zone. Other kinds of chocolate bars would also do the trick. The other kinds of chocolate bars are Sweet Choco-bar and Shroom Choco-bar which restore less HP.
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