Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan.

In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, and salt until well combined.

In another bowl, beat the softened butter until creamy, then gradually add the dry mixture until it resembles a crumbly texture.

In a separate bowl, mix the milk, eggs, lemon zest, and fresh lemon juice. Slowly add this mixture to the flour mixture while continuing to stir until everything is combined.

Gently fold in the blueberries, ensuring they’re evenly distributed throughout the batter.

Pour the mixture into the prepared baking pan and spread it evenly.

Place it in the preheated oven and bake for approximately 30 minutes, or until a toothpick inserted into the center comes out clean.

Once baked, let it cool in the pan. If desired, dust the top with powdered sugar before serving.