BEAT sugar, peanut butter and butter. Stir in crumbs.
SHAPE into 1 inch (2.5 cm) balls and place on a waxed paper-lined cookie sheet. Chill for 30 minutes or until firm.
MELT chocolate over hot water or in microwave on MEDIUM power for 2 to 3 minutes. Dip balls and place on waxed paper-lined cookie sheet; chill. Store covered in refrigerator.