In the bowl of a stand mixer fitted with the whisk attachment, on medium high speed, whip the heavy cream and powdered sugar just until stiff peaks form. Scrape the whipped ream into a clean bowl and refrigerate until step 3.
Using the same stand mixer bowl (you don't need to wash it), fitted with the paddle attachment, beat the cream cheese until smooth, about 2 minutes on high speed. With the mixer on low, gradually add the sugar and then mix on medium-high speed until smooth. Scrape down the sides and bottom of the bowl and then add sour cream and vanilla and mix until combined.
Remove the bowl from the mixer and take the whipped cream out of the refrigerator. Gently fold the whipped cream into the cream cheese mixture until fully incorporated or homogenous. Spoon the filling into the prepared graham cracker crust and refrigerate for 4 hours or until set.