To make the lemon bar crust, collect 1 cup softened butter, 1/2 cup white sugar, 2 cups flour and 4 eggs. The lemon filling calls for a separate 1 1/2 cups white sugar, 1/4 cup all-purpose flour and 2 lemons.
To begin this recipe, preheat the oven to 350 degrees Fahrenheit. Next, construct the crust of the bars, combining the softened butter, 2 cups flour and 1/2 cup sugar in a medium bowl. Mix well and then press these into the bottom of an ungreased 9-by-13-inch pan. Bake this crust in the oven for 15 to 20 minutes, or until it becomes golden brown.
In another bowl, mix together the remaining sugar and flour. Combine the eggs with the juice from the 2 lemons, and then pour this into the first bowl. Dump this entire mixture over the baked crust, and return it to the oven for another 20 minutes. The bars become firm after they cool off and can be cut into 2-by-2-inch squares. Powdered sugar can also be drizzled over them. This recipe can be replicated with lime juice and green food coloring to make a light green bar. The amount of lemon juice used in this recipe can be increased if a stronger flavor is desired.