Making Blueberry Cheesecake Bars is a straightforward process. Follow these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×9-inch baking dish with cooking spray or line it with parchment paper.
2. Make the Crust: In a medium bowl, combine the graham cracker crumbs, granulated sugar, and melted butter. Mix well until crumbly. Press the mixture firmly into the bottom of the prepared baking dish.
3. Bake the Crust: Place the baking dish in the preheated oven and bake for 10-12 minutes, or until lightly golden. Remove from the oven and set aside to cool.
4. Prepare the Filling: In a mixing bowl, beat the softened cream cheese and granulated sugar until smooth and creamy. Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract and lemon juice until fully combined.
5. Pour the Filling: Pour the cheesecake mixture over the cooled crust, spreading it evenly.
6. Bake the Cheesecake: Return to the oven and bake for 25-30 minutes, or until the center is set but still slightly jiggly. Remove from the oven and allow to cool at room temperature.
7. Prepare the Blueberry Topping: In a small saucepan, combine the blueberries, granulated sugar, cornstarch, and lemon juice. Cook over medium heat, gently stirring until the mixture begins to thicken and bubble (about 5-7 minutes).
8. Cool the Topping: Remove the blueberry mixture from the heat and allow it to cool for a few minutes before pouring it over the cheesecake layer.
9. Chill: Once the toppings have cooled slightly, spread them evenly over the cheesecake layer. Cover with plastic wrap and chill in the refrigerator for at least 4 hours, or overnight for the best results.
10. Slice and Serve: After the cheesecake is well chilled, slice into squares and serve.

These simple steps will reward you with delightful Blueberry Cheesecake Bars that are sure to impress.