Preheat the oven to 350°F (175°C). Grease and line an 8x8 inch baking pan with parchment paper.

In a mixing bowl, whisk together the melted butter and granulated sugar until combined.

Add the eggs and vanilla extract, whisking until smooth.

In a separate bowl, combine the flour, salt, and baking powder. Gradually add to the wet ingredients, mixing until just combined.

Pour the brownie batter into the prepared baking pan and spread evenly.

Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted in the center comes out clean.

In a small bowl, whisk together the powdered sugar, fresh lemon juice, and lemon zest until smooth.

Once the brownies are done baking, remove them from the oven and let them cool in the pan for about 10 minutes.

Drizzle the lemon glaze over the warm brownies and let it set before slicing.