Preheat your oven to 325°F (163°C).
Prepare the crust by combining graham cracker crumbs, sugar, and melted butter in a bowl.
Press the crumb mixture into the bottom of a 9-inch springform pan.
Bake the crust for 10 minutes, then allow it to cool while preparing the filling.
In a large mixing bowl, beat the softened cream cheese until smooth and creamy.
Add the pumpkin puree, sour cream, sugar, eggs, and spices to the cream cheese.
Beat the mixture on medium speed until fully blended and smooth.
Pour the filling into the cooled crust, smoothing the top with a spatula.
Bake the cheesecake for 1 hour, or until the edges are set but the center still jiggles slightly.
Turn off the oven, crack the door open slightly, and let the cheesecake cool in the oven for about 1 hour.
Once cooled, refrigerate the cheesecake for at least 4 hours, preferably overnight.
Before serving, remove the cheesecake from the springform pan and slice into wedges.