Crush 20 wafers; mix with sugar and 1 Tbsp. butter until well blended. Press onto bottoms of 12 paper lined muffin cups.
Microwave chocolate and remaining butter in microwaveable bowl on HIGH 1 min. or until butter is melted. Stir until chocolate is completely melted; spoon over crusts.
Beat pudding mix and milk in large bowl with whisk 2 min. Stir in COOL WHIP; spoon half over crusts. Top each with 1 of the remaining wafers. Cover with remaining pudding mixture. Refrigerate 4 hours or until set.
Remove paper liners. Top each with Chocolate-Dipped NILLA Wafer just before serving.