1 1/2 C peanut butter
1/4 C softened butter
1 C powdered sugar
Mix together and then roll and drop balls (or use a mini cookie scoop like I did) onto wax paper over a plate. Freeze for 10-20 minutes. The ratios of these ingredients can be tweaked. I like to use the least amount of sugar it takes to get them workable and tasty. When they are too sweet it takes away from that perfect peanut/chocolate flavor combo.
While they are getting solid, melt some candy melts or chocolate chips for the outsides. I like dark chocolate with my peanut butter, which is part of why I make these myself. If you like them more like the packaged stuff, I'd use milk chocolate chips or melts.
Dip those frozen PB balls with a fork into the melted chocolate and set back on the frozen plate they were on. They'll get solid pretty quick again.