In a large mixing bowl combine peanut butter, butter, vanilla and confectioners sugar. I used Reeses brand Peanut butter because the packaging reminded me of when I was a kid and apparently they having an effective marketing department. Using a pastry cutter blend until full mixed at which point you'll be able to form a large ball. Roll this ball into ropes and cut them evenly into 1 inch squares which you can then roll into balls. Place toothpick into one end and chill in the fridge for an hour.
Using a double boiler or a saucepan, melt white candy melts. Pour decorative crustal sugar in a bowl and keep next to the candy melts. Holding the sharp end of the tooth pick, dip peanut butter ball into the candy melt, allow excess to trip off and immediately coat in sugar. Set on parchment lined sheet and chill until ready to serve.
Advice and pointers: This is a super fun and easy project to do with kids! I strongly recommend against freezing your peanut butter balls as this can cause the candy melt shell to crack.