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; mix until combined and a crumbly dough forms.
03 - Press the dough evenly into the bottom of the prepared pan. Bake for 18–20 minutes or until lightly golden.
04 - While the crust is baking, whisk together eggs and sugar 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 18–20 minutes, or until the center is set.
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.