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 mixture resembles wet sand. Press firmly and evenly into the bottom of the prepared pan.
03 - Bake crust for 10 minutes until lightly golden. Remove from oven and set aside to cool while preparing filling.
04 - In a large bowl, beat softened cream cheese and granulated sugar with electric mixer on medium speed until completely smooth and creamy, about 2-3 minutes.
05 - Add pumpkin purée, eggs, sour cream, and vanilla extract. Mix on low speed until just combined, scraping down bowl sides to incorporate ingredients evenly.
06 - Add flour, pumpkin pie spice, and salt. Mix briefly on low speed until fully incorporated. Do not overmix.
07 - Pour filling over cooled crust. Tap pan gently on counter to release air bubbles. Bake for 50-60 minutes until edges are set and center jiggles slightly like gelatin.
08 - Turn off oven and crack door open slightly. Leave cheesecake inside for 1 hour to prevent cracking. Remove and cool completely at room temperature for 1 hour.
09 - Refrigerate cheesecake for at least 4 hours or overnight until completely set and cold.
10 - Whip heavy cream, powdered sugar, and vanilla extract with whisk or electric mixer until soft peaks form that hold their shape.
11 - Spread or pipe whipped cream over chilled cheesecake. Dust with cinnamon. Release springform ring, slice into wedges, and serve cold.