Heat the oven to 325°F and line an 8-inch square pan with parchment paper. Mix the almond flour, coconut flour, powdered allulose, cinnamon, salt, and melted butter for the crust.
Press the crust firmly into the pan and bake for 8 minutes. Let it cool slightly.
Beat the cream cheese and powdered allulose until smooth. Add the eggs one at a time, then mix in the sour cream and vanilla just until combined.
Spread the cheesecake filling over the crust. Mix the almond flour, powdered allulose, cinnamon, and melted butter for the churro crumble until small clusters form.
Sprinkle the cinnamon crumble evenly over the cheesecake without pressing it into the filling.
Bake for 34 to 38 minutes, until the edges are set and the center still moves slightly when the pan is nudged.
Cool completely, then refrigerate for at least 4 hours before cutting into bars.