Preheat your oven to 350 degrees F (175 degrees C). Prepare a 9-inch springform pan by greasing it and lining the bottom with parchment paper. Wrap the bottom with aluminum foil if needed to prevent leakage.
In a small bowl, mix almond flour, melted butter, powdered erythritol, and vanilla extract until you form a crumbly mixture. Press this firmly into the bottom of the springform pan to create the crust.
Bake the crust for 10–12 minutes, or until lightly golden. Let it cool for 10 minutes.
Meanwhile, in a large bowl or stand mixer, beat softened cream cheese and powdered erythritol at low speed until fluffy. Add eggs one at a time, mixing between each addition. Finally, blend in the lemon juice, zest, and vanilla extract.
Pour the filling over the cooled crust and smooth the top with a spatula. Bake for 45–55 minutes, or until the center is slightly jiggly but mostly set.
Remove the cheesecake from the oven, cool it in the pan, then cover and refrigerate overnight (or at least 4 hours) to fully set.
Run a knife along the edges of the pan before unclamping the sides. Serve chilled and enjoy!