Lightly toast the graham-cracker shell in a preheated, 350-degree oven for 10 minutes. Let cool.
Lightly warm the fudge sauce and pour into the bottom of the pie shell. Sprinkle the chopped peanut-butter cups on top of the fudge sauce. Set aside.
In a bowl, whip the cream cheese, 1/2 cup of sugar and the peanut butter until light and fluffy. In a separate bowl, whip the 1/2 cup heavy cream until soft peaks form. Lightly fold the cream into the peanut-butter mixture until well blended. Pour into pie shell and smooth out until even.