01 - Preheat oven to 325°F. Grease a 9-inch springform pan and line the base with parchment paper.
02 - Combine crushed graham crackers, melted butter, brown sugar, and cinnamon until well mixed. Press firmly into the bottom of the pan. Bake for 10 minutes, then set aside to cool.
03 - Beat cream cheese and sugar in a large bowl until smooth and creamy.
04 - Add pumpkin purée, eggs, sour cream, flour, pumpkin pie spice, vanilla extract, and salt. Mix until just combined, scraping down the sides as needed.
05 - Pour filling over the cooled crust. Tap pan gently to release air bubbles. Bake for 50–60 minutes until edges are set and center is slightly wobbly.
06 - Turn off oven, crack the door, and let cheesecake cool for 1 hour inside. Remove and cool completely at room temperature.
07 - Refrigerate for at least 4 hours or overnight until fully set.
08 - Whip heavy cream, powdered sugar, and vanilla until soft peaks form. Spread or pipe onto chilled cheesecake. Sprinkle with cinnamon if desired.
09 - Release springform ring, slice, and serve.