Make a baked cheesecake, follow your favorite recipe with the following changes.
Just forget flour, if it's called for. It's not necessary in recipes that call for just a little. If the recipe calls for a lot, find a different recipe.
Whether the recipe calls for it or not, add 1/4 cup of cream. I substitute whole milk ricotta for about 1/4 of the weight of cream cheese to get a little lift, but that's up to you. Do you want very rich? Or very, very rich.
Obviously, substitute fake for real sugar. Bump the vanilla a bit to take the edge off the fake sugar.
Make the crust with ground nuts. I've done this with almond meal, almonds, walnuts, pecans and macadamias. Use fake sugar for sweetness, and a couple of lightly-beaten egg whites to hold the crust together. Blind bake it for fifteen or twenty minutes before filling.
Hope this helps,