Tried this tonight - I dropped a spoonful of peanut butter into the middle instead of chocolate/butter. It was pretty good, although I only had splenda to sweeten and I don't think it goes well with chocolate. The peanut butter didn't work IMO - I will try it with some 80% chocolate and butter next time, and maybe wait until I get my hands on some erythritol for better sweetening. Definitely killed my chocolate craving though - thanks!