Make the Gingersnap Crust by combining ginger snap cookie crumbs, melted butter, light brown sugar, and a pinch of salt. Press into a pie pan and freeze for 15 minutes.
In a bowl, whip heavy cream until stiff peaks form. Set aside.
In a separate bowl, beat cream cheese, powdered sugar, and light brown sugar until smooth. Add pumpkin puree, sour cream, vanilla extract, pumpkin pie spice, and salt. Beat until combined.
Gently fold in whipped cream until no white streaks remain. Pour into crust and refrigerate for at least 6 hours.
Whip heavy cream, powdered sugar, and vanilla extract for topping. Spread over pie and sprinkle with pumpkin pie spice or cinnamon if desired.
Notes
For a firmer crust, pack it tightly into the pan. If you don't have a food processor, crush the cookies in a sealed bag. Refrigerate the pie for the best texture.