Preheat your oven to 350°F (175°C).
Prepare the crust: In a medium-sized mixing bowl, combine almond flour, melted butter, and erythritol (optional). Stir until everything is well mixed and crumbly.
Press into muffin tin: Line a muffin tin with paper liners and spoon the almond flour mixture into each cup, pressing it down firmly to form a compact crust.
Bake the crust: Place the muffin tin in the oven and bake for 8-10 minutes, or until the crust is golden and firm. Once baked, remove from the oven and allow it to cool completely.
Prepare the cheesecake filling: In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth and creamy. Add heavy cream, erythritol, vanilla extract, and lemon juice (if using). Beat again until everything is well combined and the filling is light and fluffy. Assemble the bites: Spoon or pipe the cheesecake filling onto the cooled almond flour crust in the muffin tin. Smooth the tops with a spoon or spatula to create an even layer.
Chill: Place the muffin tin in the refrigerator and let the cheesecake bites set for at least 2-3 hours, or overnight for best results.
Serve: Once chilled, remove the cheesecake bites from the muffin tin and serve chilled. Optionally, garnish with fresh berries, whipped cream, or a sprinkle of cinnamon.