Step 1

BEAT pudding mix and 1 cup milk with whisk 2 min. Stir in COOL WHIP. Let stand 5 min. Meanwhile, cut cake horizontally into 2 layers with serrated knife.

Step 2

STACK cake layers on serving plate, spreading pudding mixture between layers.

Step 3

MICROWAVE chocolate and butter in microwaveable bowl on HIGH 1 min.; stir until chocolate is melted. Add sugar and remaining milk; mix well. Spread over cake. Refrigerate 1 hour.