01 - Preheat oven to 350°F (175°C). Line a 9x13 inch baking pan with parchment paper, allowing overhang for easy removal.
02 - Cream together softened butter and 1/2 cup sugar until light and fluffy. Add 2 cups flour and 1/4 tsp salt, mixing just until dough forms.
03 - Press dough evenly into prepared pan. Bake for 18-20 minutes or until lightly golden.
04 - Whisk together 1 and 1/2 cups sugar and 1/4 cup flour. Add eggs, lemon juice, and lemon zest, whisking until well combined.
05 - Pour lemon mixture over hot crust immediately. Return to oven and bake for 18-20 minutes or until filling is just set in center.
06 - Remove from oven and cool completely in pan. Lift out using parchment handles and slice into 16 bars. Dust generously with powdered sugar before serving.