Step 1

Preheat the oven to 350°F. Prepare an 8x8" pan by spraying with cooking spray or lining with foil, and set aside.

Step 2

In a large bowl or the bowl of a stand mixer, beat together the butter, sugar, and lemon zest until light and fluffy. Add the eggs one at a time, mixing well after each addition, then add the lemon juice. Add the flour and baking powder, and mix until just combined.

Step 3

Pour the batter into the prepared pan and smooth into an even layer. Bake 20-25 minutes, or until a toothpick inserted into the brownies comes out clean. Let cool for 10-15 minutes.

Step 4

To make the glaze, whisk together the powdered sugar, lemon juice and zest, then pour over the brownies, spreading evenly to coat. Let cool completely before slicing and serving.