Beat together 1 cup peanut butter, cream cheese and sugar in a medium bowl with an electric mixer on medium, until well combined. Gently mix in 3 cups whipped topping until thoroughly combined. Spoon mixture to edges of the pie.
Put hot fudge in pastry bag or plastic baggie and clip corner. Decorate the top of the pie.
Refrigerate until set and ready to serve
Recipe by Sports Mom Survival Guide at https://www.sportsmomsurvivalguide.com/peanut-butter-pie/