01 - Preheat oven to 325°F. Generously butter a 9-inch springform pan and line bottom with parchment circle.
02 - Combine graham cracker crumbs, melted butter, brown sugar, and cinnamon in medium bowl until mixture resembles wet sand. Press firmly and evenly into pan bottom using measuring cup or flat bottom of glass.
03 - Bake crust for 10 minutes until lightly golden. Remove from oven and set aside while preparing filling.
04 - Using stand mixer with paddle attachment or handheld electric mixer, beat softened cream cheese and granulated sugar on medium speed until completely smooth and creamy, approximately 2-3 minutes.
05 - Add pumpkin purée, eggs, sour cream, flour, pumpkin pie spice, vanilla extract, and salt. Mix on low speed just until combined, stopping to scrape bowl bottom and sides. Do not overmix.
06 - Pour filling over cooled crust. Tap pan firmly against counter several times to release trapped air bubbles. Smooth top with offset spatula.
07 - Bake for 50-60 minutes until edges are set and center jiggles slightly like gelatin when gently shaken. Turn off oven, crack door open several inches, and let cheesecake cool in oven for 1 hour.
08 - Remove pan from oven and cool completely on wire rack, approximately 2 hours. Refrigerate at least 4 hours or preferably overnight until thoroughly chilled and set.
09 - Using chilled bowl and whisk attachment, beat heavy cream on medium-high speed until soft peaks form. Add powdered sugar and vanilla, continue beating until stiff glossy peaks form.
10 - Release springform ring carefully. Spread whipped cream over cheesecake or pipe decorative rosettes. Dust with cinnamon and serve immediately.