In a large bowl, use an electric mixer to cream together the butter and peanut butter until completely combined, smooth, and creamy
With the mixer on low, gradually add the powdered sugar, mixing until well combined. The mixture will look dry and crumbly, but should hold together when squeezed.
Line a large, rimmed baking sheet with parchment paper or wax paper.
Scoop and roll the peanut butter mixture into 1 ½-inch balls; place on the prepared baking sheet.
Cover loosely with plastic wrap and chill in the refrigerator until firm, about 1 hour.
Heat the chocolate wafers in a microwave-safe bowl at half power or on the defrost setting for 30 seconds. Stir thoroughly. If the chocolate is not completely melted after stirring, continue to microwave at 15 second intervals and stir until smooth. Do not overheat.
Using two forks, dip one peanut butter ball into the melted chocolate, turning to coat. Let any excess chocolate drip back into the bowl. Place the peanut butter ball back on the baking sheet. Sprinkle with a pinch of sea salt right away, before the chocolate has a chance to set. Repeat with remaining peanut butter balls.
Allow the chocolate to set completely. Store in an airtight container in the refrigerator up to 1 week.