Preheat oven to 350 degrees and line a 9x13 baking pan with parchment paper
Using a large bowl, whisk together the flour and baking powder
Using a standing mixer, beat together the butter, sugar, lemon juice and lemon zest until light and fluffy
Beat in eggs, one at a time until combined
Gradually beat in the dry ingredients until combined
Pour batter into the baking pan and bake in the oven for 25-28 minutes or until a toothpick comes out with moist crumbs. Make sure to not over bake.
Allow to completely cool on the counter
Using a large mixing bowl, whisk together the powdered sugar, lemon juice and lemon zest until combined
Pour the glaze over the lemon bars and spread evenly
Allow to harden overnight before enjoying!