Preheat the oven to 325°F (160°C). Place a rack in the lower third of the oven.

In a bowl, combine graham crumbs, sugar, cinnamon, and melted butter. Press the mixture firmly into the bottom of a 9-inch springform pan. Bake for 8-10 minutes until the crust is golden at the edges and fragrant.

In a large bowl, beat cream cheese until smooth and silky. Add sugar and vanilla, mixing until glossy. Crack eggs in one at a time and mix on low to avoid air bubbles. Fold in sour cream until fully blended and smooth.

In another bowl, combine pumpkin puree, cinnamon, nutmeg, ginger, flour, and brown sugar. Fold 1 cup of the cheesecake batter into the pumpkin mix to create a pumpkin ribbon.

Pour the plain cheesecake batter over the baked crust and smooth the top. Spoon dollops of the pumpkin batter on top and use a skewer to create a marbled pattern.

Place the springform pan inside a larger baking pan. Pour hot water into the outer pan until it reaches halfway up the sides of the springform. Bake for 55-65 minutes until the edges are set and the center has a small jiggle.

Turn off the oven and let the cheesecake sit inside with the door cracked open for 1 hour.

Remove from oven and water bath. Chill for at least 4 hours or overnight. Run a warm knife around the pan before slicing.

Let the cheesecake sit at room temperature for 10 minutes before slicing to ensure clean edges.

Serve with whipped cream, caramel drizzle, and nuts if desired.