Creating these incredible Blueberry Cream Cheese Bars is easy! Follow these steps for success:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease an 8×8 inch baking dish.
2. Make the Crust: In a medium bowl, combine the softened butter, granulated sugar, and vanilla. Beat until creamy. Add the egg and mix well. Gradually add the flour, baking powder, and salt, mixing until just combined.
3. Press Into Dish: Spread the crust mixture evenly into the prepared baking dish, pressing it into the bottom firmly with your hands or a spatula.
4. Bake the Crust: Bake the crust in the preheated oven for about 15 minutes, until lightly golden.
5. Prepare Cream Cheese Filling: In a mixing bowl, combine softened cream cheese, powdered sugar, and vanilla extract. Beat until smooth and creamy. Fold in lemon zest if using.
6. Add Blueberries: Gently fold in the fresh blueberries, trying not to break them.
7. Spread Filling: Pour the cream cheese and blueberry mixture over the pre-baked crust. Spread it evenly with a spatula or the back of a spoon.
8. Bake Again: Return to the oven and bake for an additional 20-25 minutes, or until the filling is set and slightly firm in the center.
9. Cool Completely: Once done, remove from the oven and let it cool at room temperature for about 1 hour before cutting.
10. Chill (Optional): For even better flavor, chill in the refrigerator for another hour before serving.

These steps will lead you to beautiful Blueberry Cream Cheese Bars that will impress everyone!