Preheat oven to 325 degrees. In a mixer bowl, using a mixer, cream butter and sugar very, very well, until light and creamy. Add flour 1 cup at a time, blending well after each addition. Knead with hands until blended and smooth.
Pat dough into a 9-inch round or square cake pan. Press edges of dough with fork and prick top of dough. Sprinkle with sugar.
Place in preheated oven and bake for 60 minutes or until lightly browned. Cool for 10 minutes and cut into bars. Makes 4 dozen pieces. Enjoy!