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 1/2 cup sugar until light and fluffy. Add flour and salt, then mix until just combined. Press evenly into the bottom of the prepared pan.
03 - Bake crust for 18 to 20 minutes until lightly golden.
04 - Whisk together 1 1/2 cups sugar, 1/4 cup flour, eggs, lemon juice, and lemon zest in a large bowl until smooth and fully incorporated.
05 - Pour lemon filling carefully over the hot crust immediately after removing it from the oven.
06 - Return pan to oven and bake for 15 to 18 minutes until the center is set and no longer jiggly.
07 - Remove from oven and cool completely on a wire rack. Lift out using parchment overhang and cut into 16 bars.
08 - Dust bars generously with powdered sugar before serving.