01 - Preheat oven to 325°F. Grease a 9-inch springform pan with butter and line the bottom with parchment paper.
02 - Combine crushed graham crackers, melted butter, brown sugar, and cinnamon in a bowl until evenly moistened. Press mixture firmly into the bottom of the prepared pan.
03 - Bake crust for 10 minutes until set. Remove from oven and let cool while preparing the filling.
04 - Beat cream cheese and granulated sugar in a large bowl until smooth and creamy, about 2-3 minutes.
05 - Mix in pumpkin purée, eggs, sour cream, flour, pumpkin pie spice, vanilla, and salt. Beat on low speed until just combined, scraping sides of bowl as needed.
06 - Pour filling over cooled crust. Gently tap pan on counter to release air bubbles. Bake for 50-60 minutes until edges are set and center has a slight wobble.
07 - Turn off oven, crack door open, and leave cheesecake inside for 1 hour. Remove and cool completely at room temperature, then refrigerate at least 4 hours or overnight.
08 - Whip heavy cream, powdered sugar, and vanilla extract until soft peaks form, about 3-4 minutes.
09 - Spread or pipe whipped cream over chilled cheesecake. Dust with cinnamon if desired. Release springform ring, slice into 12 portions, and serve cold.