Prepare the crust by combining graham cracker crumbs, sugar, and melted butter.
Press the mixture firmly into the bottom of a springform pan.
In a large bowl, beat the cream cheese until smooth and creamy.
Add the pumpkin puree, powdered sugar, vanilla extract, and spices; mix until well combined.
Spread the cream cheese mixture over the prepared crust evenly.
Chill in the refrigerator for at least 4 hours, or overnight if possible.
Top with whipped cream before serving, if desired.