Creating these amazing Blueberry Cheesecake Bars is as easy as following these steps:

1. Preheat the Oven: Preheat your oven to 325°F (160°C). Line a 9×9 inch baking pan with parchment paper, leaving some overhang for easy removal later.

2. Prepare the Crust: In a bowl, mix together graham cracker crumbs, sugar, and melted butter. Press this mixture firmly into the bottom of the prepared pan. Bake for 10 minutes, then remove and let cool.

3. Make the Cheesecake Filling: In a large mixing bowl, beat the softened cream cheese until smooth. Gradually add sugar, continuing to beat until combined.

4. Add Eggs and Vanilla: Add in the eggs, one at a time, along with the vanilla extract. Mix until everything is well incorporated and smooth.

5. Assemble the Bars: Pour the cheesecake filling over the cooled crust, spreading it evenly.

6. Prepare the Blueberry Topping: In a separate bowl, toss the blueberries with sugar, cornstarch, and lemon juice until well combined.

7. Layer Blueberries: Spoon the blueberry mixture over the cheesecake filling, swirling it gently with a knife for a marbled effect.

8. Bake: Bake in the preheated oven for 45-50 minutes, or until the edges are set and the center has a slight jiggle.

9. Cool the Bars: Once baked, remove from the oven and let cool at room temperature for about 30 minutes. Then transfer to the refrigerator to chill for at least 1-2 hours until fully set.

10. Slice and Serve: Use the parchment overhang to lift the bars from the pan. Cut into squares and serve.