Preheat Oven:

• Preheat your oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving an overhang for easy removal. Set aside.

Prepare Batter:

• In a microwave-safe bowl, combine the unsalted butter and granulated sugar. Microwave in 20-second intervals, stirring after each, until the butter is fully melted and the mixture is smooth.
• Allow the mixture to cool slightly, then whisk in the eggs one at a time, ensuring each is fully incorporated before adding the next.
• Stir in the fresh lemon juice, lemon zest, vanilla extract, and lemon extract until well combined.

Add Dry Ingredients:

• In a separate bowl, whisk together the all-purpose flour, baking powder, and salt.
• Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix.

Bake:

• Pour the batter into the prepared baking pan, spreading it evenly.
• Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.

Prepare Glaze:

• While the brownies are baking, whisk together the powdered sugar, fresh lemon juice, and lemon zest in a small bowl until smooth.

Glaze and Serve:

• Once the brownies are done, remove them from the oven and allow them to cool slightly in the pan.
• While still warm, pour the lemon glaze over the brownies, spreading it evenly.
• Allow the brownies to cool completely before lifting them out of the pan using the parchment paper overhang. Cut into squares and serve.