Heat oven to 450ºF.
Beat cream cheese and sugar with electric mixer in large bowl until well blended.
Add eggs and vanilla; beat well.
Stir in 1 2/3 cups small chocolate chips; pour into crust.
Bake 10 minutes.
Without opening oven door, reduce temperature to 250ºF; continuing baking 30 minutes or just until set.
Remove from oven to wire rack. Cool completely.
Cover; refrigerate until thoroughly chilled.
Place remaining 1/3 cup chips and whipping cream in small microwave-safe bowl.
Microwave at HIGH 20 to 30 seconds or just until chips are melted and mixture is smooth when stirred.
Cool slightly; spread over top of cheesepie.
Refrigerate 15 minutes or until topping is set.
