Prepare the Crust: Mix together almond flour, melted butter, and sweetener in a mixing bowl. Mix and continue mixing until well combined and spread the mixture over the base of a springform pan. Prebake at 325°F/160°C for about 10 minutes; remove from oven.
Prepare the Filling: Mix softened cream cheese and peanut butter until smooth. Add sweetener and continue mixing. Next incorporate (whip in), one at a time, the eggs into the batter, mixing lightly to avoid overwhipping. Add the vanilla extract and drizzle in the heavy cream, stirring until well combined.
Bake the Cheesecake: Pour filling over the crust and spread out evenly. Bake in 325°F (160°C) oven for 50 minutes or until center is slightly jiggly.
Cool and Chill: Let cool in the oven on the open door, then chill in the fridge for at least 4 hours, or overnight before slicing and serving.
