Preheat your oven to 325°F and lightly grease a 9-inch square baking pan.
For the Cookie Crust: In a medium bowl, simply whisk together the almond flour, brown sugar substitute, baking powder, and salt.
Add the room temperature egg, melted butter, and vanilla extract to the dry ingredients. Beat until a soft, uniform dough forms, then gently stir in the sugar-free chocolate chips.
Press about two-thirds of this delicious cookie dough evenly into the bottom of your prepared pan.
Bake the crust for 12 to 15 minutes, until it's just lightly golden. It won't be fully baked yet. Remove from the oven and let it cool slightly.
For the Creamy Cheesecake Filling: While the crust cools, beat the softened cream cheese in a large bowl until it's wonderfully smooth and fluffy (about 1 minute).
Mix in the powdered sweetener, sour cream (or heavy cream), and vanilla extract until everything is well combined and beautifully creamy.
Finally, gently beat in the remaining large egg until it's just mixed into the filling. Avoid overmixing!
Assemble & Bake: Carefully pour the smooth cheesecake filling over the slightly cooled cookie crust in the pan.
Take the rest of your cookie dough mixture and crumble it artfully over the top of the cheesecake filling. Press down very lightly to help it adhere.
Bake for another 20 to 25 minutes, or until the top cookie crumbles are golden brown and the cheesecake filling is just a little jiggly in the center.
Remove from the oven, let it cool completely on a wire rack, then refrigerate for at least 1 hour until nicely set. Slice into 16 bars and enjoy your healthy, homemade treat!