Preheat the oven to 350°F. Prepare an 8×8" pan by spraying with cooking spray or lining with parchment paper, and set aside.

In a large bowl or the bowl of a stand mixer, beat together salted butter, granulated sugar, and lemon zest until light and fluffy.

Add eggs one at a time, mixing well after each addition. Then add fresh lemon juice.

Add all-purpose flour and baking powder, and mix until just combined.

Pour the batter into the prepared pan and smooth into an even layer. Bake for 20-25 minutes, or until a toothpick inserted into the brownies comes out clean.

Let cool for 10-15 minutes.

For the glaze, whisk together powdered sugar, fresh lemon juice, and lemon zest, then pour over the brownies, spreading evenly to coat.

Let cool completely before slicing into 16 squares.