Lemon Blondies

Ingredients for 24 bars

BLONDIES:
1/2 cup softened unsalted butter
1 cup brown sugar
1/2 cup granulated sugar
2 large eggs
1 teaspoon vanilla extract
1 tablespoon lemon juice
Zest of 2 lemons (about 2 tablespoons)
1 teaspoon baking powder
1/2 teaspoon salt
2 cups all purpose flour

FROSTING: 
1/2 cup softened unsalted butter
1 1/2 cups powdered sugar
1/4 teaspoon salt
1 tablespoon lemon juice

Read the Instructions here