01 - Preheat oven to 350°F. Line a 9x13-inch baking pan with parchment paper, ensuring an overhang for easy removal.
02 - In a medium bowl, combine melted butter, 1/2 cup sugar, 2 cups flour, and salt. Stir until a soft dough forms. Press the mixture evenly into the bottom of the prepared pan.
03 - Bake for 18–20 minutes until lightly golden. Remove from oven and set aside.
04 - While the crust bakes, whisk together 1 1/2 cups sugar and 1/4 cup flour in a bowl. Add eggs, lemon juice, and lemon zest. Whisk until the mixture is smooth and fully combined.
05 - Pour the lemon filling over the pre-baked crust. Return to the oven and bake for another 18–20 minutes, or until the center is set and only slightly jiggles.
06 - Let the bars cool completely in the pan on a wire rack. Once cool, lift out using the parchment paper, slice into squares, and dust generously with powdered sugar.