01 - Preheat oven to 350°F. Line a 9x13-inch baking pan with parchment paper, allowing edges to overhang for easy removal.
02 - In a medium bowl, cream together the softened butter and 1/2 cup sugar until light and fluffy. Mix in 2 cups flour and salt until combined and the mixture resembles crumbly dough.
03 - Press the dough evenly into the bottom of the prepared pan. Bake for 18–20 minutes or until the surface is lightly golden.
04 - While the crust bakes, whisk together the eggs and 1 1/2 cups sugar until well blended. Add 1/4 cup flour and whisk until smooth. Stir in the lemon juice and zest.
05 - Remove the crust from the oven and reduce the oven temperature to 325°F. Pour the lemon filling over the hot crust. Return to the oven and bake for 18–20 minutes until the center is set and no longer jiggles.
06 - Let cool completely in the pan on a wire rack. Use the parchment overhang to lift the bars out. Cut into squares and dust with powdered sugar before serving.