5 cups all-purpose flour
1 cup sugar
1/2 teaspoon salt
2 cups cold butter (no substitutes)
In a large mixing bowl, combine flour, sugar and salt. Cut in butter until mixture resembles fine crumbs. Pat into an ungreased 15-in. x 10-in. x 1-in. baking pan. Prick all over with a fork. Bake at 325° for 35 minutes or until center is set. Cool for 10-15 minutes. Cut into small squares. Continue to cool to room temperature.