Line two baking sheets with waxed paper.
Beat peanut butter and butter in large mixer bowl until creamy, 3 minutes or so.
Beat in the powdered sugar until the mixture holds together. (If it’s too sticky add in a little extra powdered sugar.)
Roll in to about 3/4 to 1 inch balls and place on prepared baking sheet. Freeze for at least 1 hour.
Melt chocolate chips and shortening in a microwave safe bowl in the microwave on high for one minute. Stir and if necessary, microwave at additional 20-30 second intervals until melted and smooth.
Dip the frozen peanut butter balls into the melted chocolate using a fork and toothpick or chocolate dipping tool. Shake off excess chocolate and return to baking sheet.
Drizzle with additional chocolate if desired.
Refrigerate till chocolate is set.
Store in covered container in the refrigerator.