Mix melted butter, optional sweetener and peanut butter. Use roasted peanut butter for more complex flavor and try to use one that is sort of solid on room temperature.
Cool the mixture in the fridge or in the freezer for at least an hour. We need to roll balls out of them so don't freeze it.
Make the peanut balls. It's quite messy business so be prepared. Put the balls back into the fridge or freezer to prepare them for dipping in chocolate.
Melt chocolate.
Dip the peanut butter balls into chocolate.
Smudge in the holes then put them back into the fridge or freezer for half an hour or more and serve them from there.