01 - 
                Gather the ingredients. Preheat the oven to 350 degrees F (175 degrees C).
              
              
              
                02 - 
                To make the crust: Blend 2 cups flour, softened butter, and 1/2 cup sugar in a medium bowl until well combined.
              
              
              
                03 - 
                Press crust into the bottom of an ungreased 9x13-inch pan.
              
              
              
                04 - 
                Bake crust in the preheated oven until firm and golden, about 15 minutes.
              
              
              
                05 - 
                Meanwhile, make the filling: Whisk remaining 1 1/2 cups sugar and 1/4 cup flour in a medium bowl. Whisk in eggs, then lemon juice until smooth.
              
              
              
                06 - 
                Pour filling over the baked crust.
              
              
              
                07 - 
                Bake in the preheated oven for 20 minutes. Set the pan aside to cool completely; the bars will firm up as they cool.
              
              
              
                08 - 
                When cooled, cut bars into uniform squares.