01 - Preheat oven to 350°F. Line a 9x13-inch baking pan with parchment paper, allowing overhang on sides for easy removal.
02 - Cream butter and sugar until light and fluffy. Blend in flour and salt until dough forms. Press evenly into pan bottom.
03 - Bake crust for 18-20 minutes until edges turn lightly golden.
04 - Whisk sugar and flour together. Add eggs, lemon juice, and zest. Whisk until completely smooth.
05 - Pour filling over hot crust. Return to oven and bake 18-20 minutes until center is set and no longer wobbly.
06 - Remove from oven and cool completely in pan on wire rack for approximately 1 hour.
07 - Whisk powdered sugar, lemon juice, and zest until smooth and pourable. Spread evenly over cooled bars. Let set 20-30 minutes.
08 - Lift bars from pan using parchment. Cut into 16 squares with sharp knife. Serve chilled or at room temperature.