In a large bowl, beat together the cream cheese, granulated sugar, one cup of the marshmallow fluff. Add one cup of the creamy peanut butter and beat until combined.
8 ounces cream cheese, ⅓ cup granulated sugar, 2 cups marshmallow fluff, 1 ½ cups creamy peanut butter
In a separate bowl, fold the powdered sugar into 4 ounces of Cool Whip. Fold the cool whip mixture into the peanut butter mixture.
8 ounces Cool Whip, 2 tablespoons powdered sugar
Transfer the filling to the chilled pie crust and smooth the surface. Cover tightly with plastic wrap and refrigerate for 30 minutes.
Fold the remaining one cup marshmallow fluff into the remaining Cool Whip. Spread the marshmallow cream mixture over the chilled filling.
2 cups marshmallow fluff, 8 ounces Cool Whip
Cover the pie tightly with plastic wrap and refrigerate for at least 6 hours or overnight.