Frozen Butterfinger Cups

Place sugar, peanut butter, butter and salt in large mixer bowl. Beat until smooth. Stir in chopped Butterfinger. Place morsels in large, microwave-safe bowl. Microwave on HIGH (100%) power for 1 minute; STIR . The morsels may retain some of their original shape. If necessary, microwave at additional 10- to 15-second intervals, stirring until morsels are melted. Coat inside sides and bottoms of baking cups with melted chocolate using a small spoon or paintbrush. Transfer cups to mini muffin tin(s); freeze for 10 minutes or until set. Remove about one-third of chocolate cups from freezer. Spoon peanut butter mixture into cups, filling each about three-fourths full. Spoon melted chocolate over mixture, covering completely and filling cups to the top. Return to freezer; repeat with remaining cups. Freeze for 20 minutes or until set. Serve immediately or store in tightly covered plastic container in freezer for up to 2 weeks. To serve, remove from freezer and let cups stand for a few minutes. Peel off cup and serve cold.