Preheat oven to 325°F. Line an 8×8-inch baking pan with parchment paper.
Make the crust: In a bowl, mix almond flour, melted butter, sweetener, and all spices until crumbly. Press evenly into the prepared pan.
Bake crust for 10 minutes, then let cool slightly while you prepare the filling.
Make the cheesecake layer: In a large bowl, beat cream cheese and sweetener until smooth. Add eggs one at a time, then mix in vanilla, sour cream, and cinnamon.
Assemble: Pour the cheesecake mixture over the crust and smooth the top with a spatula.
Bake for 30–35 minutes, until the center is just set.
Cool completely, then refrigerate for at least 4 hours (or overnight).
Slice into bars and serve chilled with whipped cream and a sprinkle of cinnamon.