The Golden Choco-bar is a recipe made by Dyllis in Super Paper Mario. It is made by mixing a Mild Cocoa Bean and a Golden Leaf. It can also be purchased at Howzit's shop at Outer Space. This golden-packaged candy restores 25 HP and cures poison.
Squirps wanted chocolate in Chapter 4-4. In this case, he could split in two and open the Whoa Zone's door. This is one of few chocolate bars that would work for this. The two other chocolate bars that work for Squirps are the Sweet Choco-bar and the Shroom Choco-bar. The Golden Choco-bar restores the most HP of the three candy bars.