In a large bowl, whip the heavy cream until stiff peaks form. If using a stand mixer, use speed 10 for about 2 minutes. Refrigerate while preparing the rest of the filling.
2 ¼ cups heavy cream
In another large bowl, beat the cream cheese until smooth. Add the sugar and mix until combined. Scrape down sides, mix again to ensure maximum smoothness, (speed 10).
12 oz cream cheese, 1 ⅛ cups granulated sugar
Add peanut butter, blend until incorporated. Add vanilla and molasses, mixing until smooth. Scrape down the sides of the bowl as needed to ensure a consistent color with no streaks of white cream.
1 ½ cups creamy peanut butter, 2 tablespoons vanilla extract, 1 tablespoon molasses
Gently fold in the whipped cream until fully incorporated and the mixture is light and fluffy.
Pour the filling into the prepared crust and smooth the top.
Chill the pie in the freezer for 30 minutes or in the refrigerator for at least 4 hours before adding the ganache.