Begin by preheating your oven to 350°F (175°C). Prepare an 8x8-inch baking pan by lining it with parchment paper, ensuring you leave some overhang on the sides for easy lifting after baking.
In a medium mixing bowl, combine the graham cracker crumbs with the melted butter. Use a fork or your fingers to mix until the crumbs are thoroughly coated with the butter.
Transfer the crumb mixture to the prepared baking pan. Press it down firmly and evenly across the bottom to create a solid crust layer. Bake in the preheated oven for 10 minutes. Once done, remove from the oven and allow to cool slightly while preparing the cheesecake filling.
In a large mixing bowl, use an electric mixer to beat the softened cream cheese and granulated sugar together on medium speed until the mixture becomes smooth and creamy, with no lumps remaining.
Add the eggs to the cream cheese mixture one at a time, mixing well after each addition to ensure they are fully incorporated. Next, add the sour cream, freshly squeezed lemon juice, lemon zest, vanilla extract, and a pinch of salt, mixing on low speed until everything is blended and smooth.
Carefully fold in the fresh blueberries using a spatula, being gentle to avoid breaking the berries.
Pour the prepared cheesecake filling over the cooled graham cracker crust, spreading it evenly to cover the crust completely.
Bake the cheesecake bars in the oven for 30-35 minutes. The edges should be set, with the center remaining slightly jiggly. The top should have a light golden hue, indicating it's done.
After baking, remove the pan from the oven and let it cool at room temperature for about 1 hour. Once cooled, transfer it to the refrigerator and chill for at least 3 hours, or ideally overnight, to allow the bars to set completely.
To serve, lift the cheesecake out of the pan using the edges of the parchment paper. Place it on a cutting board and slice into bars of your desired size.
Notes
Serve the chilled bars dusted with powdered sugar and garnish with fresh blueberries and mint.