01 - Preheat oven to 350°F. Line a 9x13-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium bowl, cream together butter and sugar until light and fluffy. Add flour and salt, mixing until combined and a crumbly 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 - While the crust is baking, whisk together eggs and sugar in a separate bowl until well blended. Add flour and whisk until smooth. Stir in lemon juice and zest.
05 - Remove the crust from the oven and lower the temperature to 325°F. Pour the lemon filling over the hot crust. Return pan to the oven and bake for 18 to 20 minutes, or until the center is set and does not jiggle when gently shaken.
06 - Cool completely in the pan on a wire rack. Lift bars out using parchment overhang and cut into squares. Dust with powdered sugar before serving.