Step 1: Prepare the Crust

1. Preheat your oven to 325°F (163°C) and line a 9×13-inch baking pan with parchment paper, leaving an overhang for easy removal.
2. In a medium bowl, combine crushed graham crackers (or your chosen base), melted butter, and sugar. Mix until the texture resembles wet sand.
3. Press the mixture evenly into the bottom of the prepared pan. Use the back of a spoon or a flat-bottomed glass to compact the crust firmly.
4. Bake the crust for 8-10 minutes, then let it cool while preparing the filling.

Step 2: Make the Cheesecake Filling

1. In a large mixing bowl, beat the softened cream cheese with a hand or stand mixer on medium speed until smooth and creamy.
2. Add the sugar, vanilla extract, and lemon juice (if using). Mix until well combined.
3. Beat in the eggs one at a time, mixing just until incorporated after each addition. Avoid overmixing to prevent air bubbles.

Step 3: Assemble and Bake

1. Pour the cheesecake filling evenly over the cooled crust. Smooth the top with a spatula.
2. Bake in the preheated oven for 30-35 minutes, or until the edges are set and the center jiggles slightly.
3. Remove from the oven and let the bars cool to room temperature. Then, refrigerate for at least 4 hours or overnight for the best texture.

Step 4: Add Toppings and Serve

1. Once chilled, lift the cheesecake bars from the pan using the parchment paper overhang.
2. Slice into squares or rectangles with a sharp knife, cleaning the blade between cuts for clean edges.
3. Top with your choice of fruit, chocolate drizzle, whipped cream, or other toppings.
4. Serve chilled and enjoy!