01 - Preheat the oven to 350°F. Line a 9x13-inch baking pan with parchment paper, leaving an overhang to facilitate removal.
02 - In a medium bowl, cream together softened butter and granulated sugar until light and fluffy. Incorporate flour and salt, mixing until the mixture is crumbly but combined.
03 - Press the crust mixture evenly into the prepared pan. Bake for 18 to 20 minutes, or until lightly golden in color.
04 - While the crust bakes, whisk sugar and flour in a large bowl. Beat in eggs, then stir in lemon juice and lemon zest until the filling is smooth.
05 - Pour the lemon filling over the warm crust. Return to the oven and bake for 20 to 22 minutes, until the filling is set with a slight jiggle at the center.
06 - Allow the bars to cool completely in the pan on a wire rack. Lift out using the parchment paper overhang, dust with powdered sugar, and cut into 16 squares.