Prepare the Pan: Preheat your oven to 350°F (175°C). Line an 8x8-inch pan with parchment paper, leaving an overhang for easy removal. Grease the exposed edges.

Infuse the Sugar: In a bowl, rub the lemon zest into the sugar with your fingers until fragrant.

Mix the Wet Ingredients: Add melted butter to the sugar and whisk. Incorporate eggs one at a time, followed by lemon juice, vanilla extract, and lemon extract.

Combine Dry Ingredients: In a separate bowl, whisk together flour, salt, and baking powder. Gradually fold this into the wet mixture until just combined.

Bake: Pour the batter into the pan, spread evenly, and bake for 23-25 minutes. The edges should be golden, and a toothpick inserted in the center should come out with moist crumbs.

Cool: Let the Lemon Brownies cool in the pan on a wire rack for about an hour.

Prepare the Glaze: Whisk together the powdered sugar, lemon juice, zest, and salt. Adjust the consistency if needed.

Glaze and Serve: Once the brownies are fully cooled, spread the glaze evenly. Let it set for 30 minutes before cutting into 16 squares.