Preheat the oven to 350?F. Prepare an 8x8 inch 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 ? cup salted butter, ? cup granulated sugar, and the zest of one lemon until light and fluffy.

Add 2 eggs one at a time, mixing well after each addition, then add 1 Tablespoon fresh lemon juice.

Add ? cup all-purpose flour and ? teaspoon 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 ? cup powdered sugar, 1 ? Tablespoons lemon juice and ? lemon zest, then pour over the brownies, spreading evenly to coat.

Let cool completely before slicing into 16 squares.