Preheat the oven to 350°F (175°C).
In a mixing bowl, combine graham cracker crumbs, melted butter, and sugar for the crust. Mix until well combined. Press the mixture firmly into the bottom of the springform pan. Bake in the preheated oven for 10 minutes, then remove and let cool.
In another bowl, beat the softened cream cheese with an electric mixer until smooth. Gradually add sugar and beat until creamy.
Add the mashed sweet potatoes, eggs, vanilla extract, pumpkin pie spice, cinnamon, and salt. Blend until smooth and well combined.
Gently fold in sour cream until just combined.
Pour the filling into the cooled crust, smoothing the top with a spatula.
Place the springform pan on a baking sheet and bake for 50-60 minutes, or until the center is set and slightly jiggly.
Turn off the oven and leave the cheesecake inside for 1 hour to cool gradually.
Remove from the oven, cover with aluminum foil, and refrigerate for at least 4 hours or overnight before serving.