Prep your pan: Line the bottom of an 8- or 9-inch springform pan with parchment. Lightly grease the sides to make slicing clean and easy.
Make the crust: In a bowl, mix 2 cups almond flour, 3–4 tablespoons granulated sweetener, a pinch of salt, and 6 tablespoons melted butter.
Stir until the mixture looks like damp sand and holds together when pressed.
Press and chill: Pour the crust mixture into the pan. Press firmly into an even layer using the bottom of a measuring cup. Chill in the fridge while you prepare the filling.
Whip the cream: In a cold bowl, whip 1 cup heavy cream to medium-stiff peaks.
Set aside. This adds lift to the filling without gelatin.
Beat the cream cheese: In a separate mixing bowl, beat 24 ounces softened cream cheese on medium speed until smooth and fluffy, about 2 minutes. Scrape the bowl as needed.
Add flavor and sweetener: Beat in 2/3–3/4 cup powdered sweetener, 1–1.5 teaspoons vanilla, 1–2 tablespoons lemon juice, and optional lemon zest.
Taste and adjust sweetness or lemon to your liking.
Fold in the whipped cream: Gently fold the whipped cream into the cream cheese mixture in two additions. Keep the mixture light and airy.
Fill the pan: Spoon the filling onto the chilled crust. Smooth the top with an offset spatula.
Tap the pan lightly to release air bubbles.
Chill to set: Cover and refrigerate for at least 6 hours, preferably overnight. The filling will firm up and slice cleanly.
Unmold and garnish: Run a thin knife around the edge before releasing the springform. Top with a few berries or a dusting of powdered sweetener if desired.
Slice and serve: Use a hot, dry knife for neat slices.
Wipe the blade between cuts for the cleanest presentation.