01 - Preheat oven to 350°F. Line a 9x13 inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a large bowl, cream together softened butter and 1/2 cup sugar until light and fluffy. Add 2 cups flour and 1/4 teaspoon salt, mixing just until dough forms.
03 - Press dough evenly into bottom of prepared pan. Bake for 18-20 minutes until lightly golden.
04 - While crust bakes, whisk together sugar and flour in medium bowl. Add eggs, lemon juice, and lemon zest, whisking until well combined.
05 - Pour lemon mixture over hot crust immediately after removing from oven.
06 - Bake for another 18-20 minutes until filling is just set in center.
07 - Remove from oven and let cool completely in pan. Once cool, lift out using parchment handles and slice into 16 bars.
08 - Dust generously with powdered sugar before serving.