01 - Preheat oven to 325°F. Generously grease a 9-inch springform pan and line the base with parchment paper.
02 - Combine crushed graham crackers, melted butter, brown sugar, and cinnamon in a mixing bowl until evenly incorporated. Press mixture firmly into the base of the prepared pan. Bake for 10 minutes, then set aside to cool slightly.
03 - In a large mixing bowl, beat cream cheese and sugar using an electric mixer until smooth and creamy, approximately 3 minutes.
04 - Add pumpkin purée, eggs, sour cream, flour, pumpkin pie spice, vanilla extract, and salt. Beat until just combined, scraping down sides of bowl as needed. Do not overmix.
05 - Pour filling over the cooled crust. Tap pan gently on countertop to release trapped air bubbles. Bake for 50 to 60 minutes until edges are set and center maintains a slight wobble.
06 - Turn off oven and crack door open. Allow cheesecake to rest in cooling oven for 1 hour. Remove and cool completely at room temperature, then chill minimum 4 hours or overnight.
07 - Whip heavy cream, powdered sugar, and vanilla extract until soft peaks form. Spread or pipe generously onto chilled cheesecake. Dust with ground cinnamon for garnish.
08 - Release springform ring, slice into wedges, and serve chilled.