01 - Preheat oven to 350°F. Line a 9x13-inch baking pan with parchment paper, leaving overhang for easy removal.
02 - In a large bowl, cream together butter and sugar until light and fluffy. Mix in flour and salt until soft dough forms. Press evenly into bottom of prepared pan.
03 - Bake crust for 18-20 minutes, until lightly golden around edges.
04 - While crust bakes, whisk together sugar and flour in medium bowl. Add eggs, lemon juice, and zest; whisk until smooth and fully combined.
05 - Pour lemon filling over hot crust. Return to oven and bake 18-20 minutes more, until center is just set and no longer wobbly.
06 - Remove from oven and let cool completely in pan on wire rack, about 1 hour.
07 - Whisk together powdered sugar, lemon juice, and zest until smooth and pourable. Spread evenly over cooled bars. Let glaze set for 20-30 minutes.
08 - Lift bars from pan using parchment overhang. Cut into 16 squares with sharp knife. Serve chilled or at room temperature.