Prep the pan and oven: Heat oven to 325°F (163°C).
Lightly coat a springform pan with cooking spray. For easy release, line the bottom with parchment.
Make the crust: Stir graham crumbs, brown sugar, melted light butter, and a pinch of salt until the texture feels like damp sand. Press firmly into the bottom of the pan with the bottom of a measuring cup.
Prebake the crust: Bake for 8–10 minutes until set and lightly fragrant.
Cool for 5 minutes while you mix the filling.
Beat the cream cheese: In a large bowl, beat softened cream cheese on medium speed until smooth and no lumps remain, about 1–2 minutes. Scrape the bowl.
Add yogurt and sweetener: Mix in Greek yogurt and sugar (or sweetener) until silky. Avoid overbeating to keep air out of the batter.
Add pumpkin and flavorings: Beat in pumpkin puree, vanilla, spices, and salt until fully combined.
The batter should be uniform in color.
Incorporate eggs: Add eggs one at a time on low speed, mixing just until blended. Do not whip.
Fill the pan: Pour the batter over the crust and smooth the top with a spatula. Tap the pan lightly on the counter to release air bubbles.
Bake low and slow: Bake at 325°F (163°C) for 40–50 minutes.
The edges should be set, and the center should wobble slightly like gelatin.
Cool gradually: Turn off the oven, crack the door, and let the cheesecake rest inside for 30 minutes. This helps prevent cracks.
Chill to set: Move to a cooling rack until room temperature, then cover and chill for at least 6 hours, preferably overnight.
Serve: Run a thin knife around the edge, release the springform, and slice with a warm, clean knife. Add a light dollop of whipped topping and a sprinkle of cinnamon if you like.