Could you tell me how to prepare Blueberry Blondies?
Here's a recipe for Blueberry Blondies:

Ingredients:

• nonstick cooking spray, for greasing
• 1 cup all purpose flour
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 6 tablespoons unsalted butter, melted
• 1 cup brown sugar
• 1 large egg
• 2 teaspoons vanilla extract
• 1 1/2 cups fresh blueberry, divided

Instructions:

1. Preheat the oven to 350°F (180°C). Grease a 8-inch (20 cm) square baking dish with nonstick spray and line with parchment paper. Let the parchment hang over 2 sides of the pan for easy removal.
2. In a medium bowl, whisk together the flour, baking powder, and salt.
3. In a large bowl, whisk together the butter and brown sugar until smooth. Add the egg and vanilla and whisk to combine. Stir in the dry ingredients until just combined, then fold in 1 cup of blueberries.
4. Transfer the batter to the prepared pan and smooth the top. Gently press the remaining 1/2 cup (50 g) blueberries into the top of the batter.
5. Bake for 30-40 minutes, until a toothpick inserted in the center comes out clean. Let the blondies cool for 15-20 minutes before removing from the pan and slicing.

Enjoy your Blueberry Blondies!