Prep your pan and oven. Heat the 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 with foil if your pan tends to leak.
Make the crust. In a bowl, mix 2 cups almond flour, 1/4 cup granulated keto sweetener, a pinch of sea salt, and 6 tablespoons melted butter. Stir until it resembles damp sand.
Press and par-bake. Press the crust mixture firmly into the bottom of the pan. Use the bottom of a measuring cup to compact it.
Bake for 10 minutes until just set and lightly golden. Cool while you make the filling.
Soften and smooth the cream cheese. In a large bowl, beat 24 ounces softened cream cheese on medium speed until creamy and lump-free, about 1–2 minutes. Scrape the bowl.
Sweeten and flavor. Add 3/4 cup powdered keto sweetener, 1 teaspoon vanilla, a pinch of salt, and optional 1/2 teaspoon lemon zest and 1/8 teaspoon almond extract.
Beat on low until combined. Avoid whipping in too much air.
Add the dairy. Mix in 1/2 cup sour cream and 1/4 cup heavy cream on low until silky. Scrape the bowl again for an even texture.
Incorporate the eggs. Add 3 large eggs one at a time, mixing on low just until combined after each.
Do not overmix.
Fold in the chips. Toss 2/3 cup sugar-free chocolate chips with a teaspoon of almond flour to prevent sinking, then fold gently into the batter.
Set up a gentle bake. Pour the filling over the crust. Tap the pan on the counter a few times to release air bubbles. For the smoothest texture, place the pan on a rack in the middle of the oven with a separate pan of hot water on the lower rack to create steam.
Bake low and slow. Bake 45–60 minutes.
The edges should be set, and the center should still jiggle slightly like gelatin. If it browns too quickly, tent loosely with foil.
Cool gradually. Turn off the oven, crack the door, and let the cheesecake sit for 45 minutes. Then move it to the counter to cool to room temperature.
Chill completely. Cover and refrigerate at least 6 hours, preferably overnight.
This step sets the texture and deepens the flavor.
Optional finish. Melt 2 tablespoons sugar-free chocolate chips with 1 teaspoon coconut oil. Drizzle over the chilled cheesecake. Sprinkle a few extra chips on top.
Slice cleanly. Run a knife around the edge of the pan before releasing the springform.
Warm a sharp knife under hot water, wipe dry, and slice. Clean the knife between cuts for neat wedges.