MICROWAVE 21 Nestlé Hearts in medium, uncovered, microwave-safe bowl on MEDIUM-HIGH (70%) power for 1 minute; STIR. The Nestlé Hearts may retain some of their original shape. If necessary, microwave at additional 10- to 15-second intervals, stirring just until melted. With a small pastry brush, coat inside of 15 small candy paper liners with melted chocolate.
REFRIGERATE for 20 minutes; coat any thin spots. Refrigerate for an additional 30 minutes or until firm.
BEAT peanut butter, sugar and butter in small mixer bowl until creamy.
PEEL paper gently from chocolate cups. Fill each cup with 1 tablespoon peanut butter filling. Before serving, top each cup with 1 Nestlé Heart. Store in refrigerator.