In an electric mixer fitted with the whisk attachment, beat the cream cheese until smooth. Add the powdered sugar and mix until combined. Mix in peanut butter and milk and beat until smooth.
Fold in whipped topping with a spatula.
Spoon the mixture into the prepared pie plate. Cover and freeze until firm, about 4 hours.
Before serving top the pie with chopped reeses peanut butter cups and fudge sauce if desired.
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Notes
Use Cool Whip. Homemade whipped cream goes lax a lot quicker and more easily than Cool Whip.Keep refrigerated. Nutritional information doesn't include the pie crust or Reese's peanut butter cups. Recipe adapted from Allrecipes.