Preheat oven to 350°F (175°C) and line a baking dish with parchment paper

In a bowl, mix almond flour, melted butter, and sweetener until crumbly

Press mixture firmly into the base of the baking dish to form a crust

Bake for 8–10 minutes until lightly golden, then let cool

In a mixing bowl, beat cream cheese and sweetener until smooth

Add sour cream, vanilla, and lemon juice, then mix until creamy

Pour filling over the cooled crust and spread evenly

Bake for 25–30 minutes until set but slightly jiggly in the center

Let cool completely, then refrigerate for at least 3–4 hours until firm

In a saucepan, cook berries with sweetener and lemon juice until slightly thickened

Let topping cool, then spread over chilled cheesecake

Slice into bars and serve