Prep the pan and oven. Preheat your oven to 325°F (163°C).
Line the bottom of a 9-inch springform pan with parchment and lightly grease the sides. Wrap the outside of the pan with two layers of heavy-duty foil to make it water-bath friendly.
Make the crust. In a bowl, mix almond flour, sweetener, salt, and cinnamon. Stir in melted butter and vanilla until the mixture looks like damp sand.
Press firmly into the bottom of the pan in an even layer.
Par-bake the crust. Bake the crust for 10 minutes. Set aside to cool slightly while you make the filling. Keep the oven at 325°F.
Beat the cream cheese. In a large bowl, beat softened cream cheese with a hand mixer or stand mixer on medium speed for 1–2 minutes, until smooth and fluffy.
Scrape down the bowl.
Add sweetener and sour cream. Beat in the powdered sweetener until fully dissolved, then mix in sour cream, vanilla, lemon juice, and salt. Blend until smooth, pausing to scrape the bowl.
Add eggs gently. Add the eggs one at a time on low speed, mixing just until combined. Do not overmix—this helps prevent cracks and excess air bubbles.
Fill the pan. Pour the batter over the crust. Tap the pan lightly on the counter to release air bubbles.
Place the springform pan in a large roasting pan.
Water bath. Pour hot water into the roasting pan until it reaches halfway up the springform pan’s sides. Carefully transfer to the oven.
Bake. Bake for 55–70 minutes, until the edges are set and the center has a slight wobble. Do not overbake—the cheesecake will finish setting as it cools.
Cool slowly. Turn off the oven, crack the door, and let the cheesecake sit for 45–60 minutes. Remove from the water bath, take off the foil, and cool to room temperature.
Chill. Cover and refrigerate for at least 6 hours, preferably overnight.
This step is key for the best texture and clean slices.
Optional topping. Stir sour cream, sweetener, and vanilla until smooth. Spread over the chilled cheesecake before slicing, or serve on the side.
Slice and serve. Run a knife around the edge, release the springform, and slice with a hot, clean knife. Serve plain or with a few berries.