INSTRUCTIONS
- Preheat oven to 350°F and prepare a 9×9-inch pan by lining it with parchment paper (or lightly grease and flour). (You could use a 9×13-inch pan for more servings, but the bars will be thinner.)
- In a large bowl, combine the melted butter and brown sugar. Stir well.
- Add the eggs and the egg yolk, one at a time, stirring well after each addition.
- Stir in the lemon juice and lemon zest.
- In a separate, medium-sized bowl, whisk together the flour, cornstarch, baking powder, and salt.
- Gradually stir the flour mixture into the butter and egg mixture until completely combined.
- Spread the batter evenly into the prepared pan. Bake 35-45 minutes, or until the edges are turning golden brown. (If you are using a 9×13-inch pan, bake for 25-30 minutes.)
- Allow brownies to cool before glazing.
GLAZE
- In a medium bowl, combine the confectioners’ sugar and water and whisk until smooth.
- Pour the glaze over the cooled brownies and serve.