SPREAD bananas onto bottom of crust; top with nuts and caramel topping.
BEAT pudding mix and milk in large bowl with whisk 2 min. Stir in half the COOL WHIP; spoon into crust.
MICROWAVE chocolate in medium microwaveable bowl on HIGH 1-1/2 min. or until melted, stirring every 45 sec. Whisk in remaining COOL WHIP; cool slightly. Spread over pie. Refrigerate 4 hours.
