#1 Microwave chocolate and butter in large microwaveable bowl on HIGH 1 minute stir. Repeat microwaving and stirring in 15 second intervals until chocolate is completely melted and mixture is well blended. #2 Add nuts and broken wafers mix well. #3 Refrigerate 1 1/2 hours or until chocolate mixture is firm. #4 Roll chocolate mixture into 9-inch log wrap tightly with plastic wrap. Refrigerate 1 hour. #5 Place unwrapped chocolate log on plate sprinkle evenly with powdered sugar. #6 Cut into 16 slices to serve.