Preheat oven to 325°F (165°C). Line the bottom of an 8-inch springform pan with parchment paper and lightly grease the sides.
In a bowl, mix almond flour, melted butter, erythritol, cinnamon, and salt until crumbly.
Press crust mixture firmly into the bottom of the pan.
Bake for 8–10 minutes until golden, then let cool.
In another bowl, beat cream cheese until smooth.
Add pumpkin puree, erythritol, pumpkin spice, cinnamon, and vanilla, and mix until creamy.
Add eggs one at a time, mixing on low speed.
Pour in heavy cream and mix gently until smooth.
Pour filling over the crust and smooth the top.
Bake for 50–55 minutes, until the center is mostly set but slightly jiggly.
Turn off oven, crack door open, and let cheesecake cool inside for 1 hour.
Refrigerate for at least 4 hours or overnight.
Top with whipped cream and a sprinkle of cinnamon before serving.