Preheat your oven to 350°F (175°C) and line an 8x8-inch baking pan with parchment paper, leaving overhang on the sides for easy removal.
In a medium bowl, mix together the graham cracker crumbs, melted butter, and ¼ cup sugar until well combined. Press this mixture firmly into the bottom of the prepared baking pan to form an even crust.
In a large mixing bowl, beat the softened cream cheese until smooth and creamy. Gradually add in 1 cup of sugar, continuing to beat until fully incorporated.
Add the eggs one at a time, mixing well after each addition. Then, mix in the lemon juice, lemon zest, and vanilla extract until everything is well combined.
Gently fold in the fresh blueberries along with the cornstarch to prevent them from sinking to the bottom during baking.
Pour the cheesecake batter over the crust in the baking pan and spread evenly.
Bake in the preheated oven for 30-35 minutes, or until the center is set but still slightly jiggly.
Remove from the oven and allow to cool to room temperature for about an hour, then refrigerate for at least 4 hours, or overnight for best results.
Once chilled, lift the cheesecake out of the pan using the parchment paper. Cut into bars and serve.
Notes
Serve the cheesecake bars on a decorative platter, garnished with additional fresh blueberries and lemon slices for a refreshing touch.