01 - Preheat your 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 the softened butter and 1/2 cup sugar until light and fluffy. Add 2 cups flour and 1/4 teaspoon salt, mixing just until the dough forms.
03 - Press the dough evenly into the bottom of the prepared pan. Bake for 18 to 20 minutes, or until lightly golden.
04 - In a medium bowl, whisk together the sugar and flour. Add eggs, lemon juice, and lemon zest, and whisk until well combined.
05 - Pour the lemon mixture over the hot crust immediately after removing it from the oven.
06 - Bake for another 18 to 20 minutes, or until the filling is just set in the center.
07 - Remove from oven and let cool completely in the pan. Once cool, lift out using the parchment handles and slice into 16 bars.
08 - Dust generously with powdered sugar before serving.