Preheat the oven to 350°F (175°C) and line a 9x9-inch baking pan with parchment paper, leaving an overhang.
In a mixing bowl, combine the graham cracker crumbs, sugar, and melted butter for the crust. Press the mixture into the bottom of the prepared pan.
Bake the crust for 10 minutes, then remove from the oven and let it cool.
In a separate bowl, beat the cream cheese and sugar until smooth. Add the eggs one at a time, mixing well after each addition.
Stir in the sour cream, lemon juice, and lemon zest until combined. Pour the cheesecake filling over the cooled crust.
Bake for 25-30 minutes or until the center is set. Remove from the oven and let it cool to room temperature.
In a saucepan, combine the blueberries, sugar, cornstarch, and water for the topping. Cook over medium heat, stirring occasionally, until the mixture thickens.
Spread the blueberry topping over the cooled cheesecake layer. Refrigerate the cheesecake bars for at least 4 hours to set.
Once chilled, lift the bars out of the pan using the parchment overhang. Cut into squares and serve chilled.
Enjoy these delightful Lemon Blueberry Cheesecake Bars!