In a large mixing bowl, combine powdered sugar, REESE Spreads and butter. Roll into balls (about 1 inch in size) and place on a sheet of wax paper.
Melt chocolate chips in the microwave at 30 second increments on 50% power, stirring in between, until melted. Dip the balls in the chocolate and then roll in crushed REESE’S Pieces. Place back on waxed paper.
Let balls harden at room temperature for about 1 hour before serving.