Spoon reserved 1 cup whipped cream on top of cream cheese mixture, spreading evenly. Sprinkle with remaining 1/2 cup chopped peanut butter cups. In same small microwavable bowl, microwave remaining 1 tablespoon hot fudge uncovered on High 5 to 10 seconds or until thin enough to drizzle. Drizzle on top of pie. Refrigerate 3 hours before serving.