Beat pudding mix and 1 cup milk with whisk two minutes. Stir in Cool Whip. Let stand 5 minutes. Meanwhile, cut cake horizontally into 2 layers with serrated knife. Stack cake layers on serving plate, spreading pudding mixture between layers. Microwave chocolate and butter in microwaveable bowl on high 1 minute; stir until chocolate is melted. Add sugar and remaining milk; mix well. Spread over cake. Refrigerate 1 hour.
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