1In a large bowl, mix cream cheese, sugar, 1 tablespoon milk and peanut butter until smooth. Gently stir in 1 1/2 cups of whipped topping. Spread mixture on bottom of pie crust.
2In a second bowl, stir pudding mix with 2 cups milk until thick. Immediately stir in remaining whipped topping. Spread mixture over peanut butter layer.
3Scatter peanut butter cups over top of pie. Cover and refrigerate for 4 hours.