Stir together crumbs, sugar and butter. Press in a single layer on the bottom and up sides of a springform pan. Chill in the freezer for at least fifteen minutes.

Preheat oven to 350ºF. Whisk together pumpkin, eggs, brown sugar, cream, vanilla, and bourbon in a large bowl. In a separate bowl, whisk together sugar, cornstarch, cinnamon, nutmeg, ginger and salt. Add cream cheese and beat with an electric mixer on high until creamy. Reduce speed and add pumpkin mixture. Pour filling into crust, smoothing top. Bake until center is set, 50 to 60 minutes. LEAVE OVEN ON. Transfer to a rack to let cool while making the topping (about 5 minutes).

Whisk together sour cream, sugar, and bourbon. Spread on top of cheesecake and bake for 5 minutes more. Cool cheesecake completely before transferring to the refrigerator. Refrigerate for at least 4 hours before serving.