For the Crust:
For the Filling:
1Stir together graham cracker crumbs, hazelnuts, sugars and olive oil in a bowl until combined. Press crumb mixture evenly into the only the bottoms of the springform pans.
2Put the oven rack in the middle position and preheat the oven to 350°F.
3Whisk together pumpkin, eggs, brown sugar, cream, vanilla, and bourbon (if using) in a bowl until combined.
4In a separate bowl, stir together granulated sugar, cornstarch, cinnamon, nutmeg, ginger, and salt.
5Add cream cheese and beat with an electric mixer at high speed until creamy and smooth, about 3 minutes.
6Reduce speed to medium, then add pumpkin mixture and beat until smooth. Pour filling into the pans, on top of the crust, smoothing the tops.
7Bake until center is just set, 50 to 60 minutes. Transfer to rack and cool 5 minutes.
8Sprinkle with chopped Baci.