Step 1: Prepare the Crust

1. Preheat oven to 350°F (175°C) and line an 8×8-inch baking dish with parchment paper.
2. In a mixing bowl, combine almond flour, cocoa powder (if using), melted coconut oil, erythritol, vanilla extract, and salt. Mix until well combined.
3. Press the crust mixture evenly into the bottom of the prepared baking dish. Bake for 10–12 minutes or until lightly golden. Remove from the oven and let cool slightly.

Step 2: Prepare the Cheesecake Filling

1. In a large mixing bowl, beat the softened cream cheese until smooth and creamy.
2. Add erythritol, eggs, vanilla extract, and lemon juice (if using). Beat until smooth and fully combined.

Step 3: Assemble and Bake

1. Pour the cheesecake filling over the cooled crust and spread evenly.
2. Bake for 20–25 minutes, until the edges are set and the center is slightly jiggly.
3. Turn off the oven and leave the cheesecake inside for about 1 hour. Remove and let cool to room temperature, then refrigerate for at least 2 hours.

Step 4: Serve

1. Remove the cheesecake from the pan using parchment paper, cut into bars, and serve.