Cream together butter and sugar. Mix in flour and salt. Dough will look crumbly.

Pour entire bowl onto a cookie sheet. Spread out evenly over the entire sheet, pressing down, almost like making a crust. Should be about 1/2" high. Poke every 2 inches with a fork.

Place in oven at 275 degrees F for an hour, until slightly golden brown.

Let cookies cool on the baking sheet for about 10 minutes. Cut into squares or diamonds. A pizza cutter works great.