Preheat the oven to 350°F (175°C).

In a mixing bowl, combine the softened butter and granulated sugar until well blended.

Add the eggs, lemon juice, and lemon zest to the mixture and mix until smooth.

In another bowl, whisk together the all-purpose flour, baking powder, and salt.

Gradually fold the dry ingredients into the wet mixture until just combined.

Pour the batter into a greased baking dish.

Bake in the preheated oven for about 25 minutes or until a toothpick inserted comes out clean.

Allow to cool and prepare the lemon glaze by mixing the powdered sugar with lemon juice.

Drizzle the glaze over the cooled brownies before slicing.