Bourbon Pumpkin Cheesecake

For crust

3/4 cup graham cracker crumbs (from five 4 3/4- by 2 1/4-inch crackers)
1/2 cup pecans (1 3/4 ounce), finely chopped
1/4 cup packed light brown sugar1/4 cup granulated sugar
1/2 stick (1/4 cup) unsalted butter, melted and cooled

For filling
1 1/2 cups canned solid-pack pumpkin
3 large eggs
1/2 cup packed light brown sugar
2 tablespoons heavy cream from a pint (you will be using the rest for the topping)
1 teaspoon vanilla
1 tablespoon bourbon liqueur or bourbon (optional)
1/2 cup granulated sugar
1 tablespoon cornstarch
1 1/2 teaspoons cinnamon
1/2 teaspoon freshly grated nutmeg
1/2 teaspoon ground ginger
1/2 teaspoon salt
3 (8 ounce) packages cream cheese, at room temperature

For topping
the rest of a pint of heavy cream
1/3 cup powdered sugar
1 teaspoon lemon juice
1 tablespoon bourbon liqueur or bourbon (optional)

Make crust: Stir together crumbs, pecans, sugars, and butter in a bowl until combined well. Press crumb mixture evenly onto bottom and 1/2 inch up side of pan, then chill crust, 1 hour.
Make filling and bake cheesecake: Put oven rack in middle position and Preheat oven to 350°F. Whisk together pumpkin, eggs, brown sugar, cream, vanilla, and liqueur (if using) in a bowl until combined. Stir together granulated sugar, cornstarch, cinnamon, nutmeg, ginger, and salt in large bowl. Add cream cheese and beat with an electric mixer at high speed until creamy and smooth, about 3 minutes. Reduce speed to medium, then add pumpkin mixture and beat until smooth. Pour filling into crust, smoothing top, then put springform pan in a shallow baking pan (in case springform leaks). Bake until center is just set, 50 to 60 minutes. Transfer to rack and cool 5 minutes. Cool cheesecake completely in pan on rack, about 3 hours. Chill, covered, until cold, at least 4 hours. Remove side of pan and bring to room temperature before serving.
Make topping: Beat ingredients together with a mixer with the whisk attachment until firm, then spread on top of cheesecake and serve.
Baked cheesecake can be chilled, covered, up to 2 days.
Source: Adapted from the recipe at Smitten Kitchen.