Slice the butter and place them in a large bowl. Combine sugar, salt, and flour with butter, and mix until a dough is formed.
Make a rectangle-shaped dough slab. Cover and let it sit in the refrigerator.
Cover and chill the dough for at least 2 hours.
Next, slice the dough slab into 1/2 inch thick slices. place them on baking mat and let it sit in the refrigerator once again until oven is pre-heated.
Preheat the oven to 350 deg F. Bake for 15 -18 mins or until edges turn lightly golden.
Straighten the edges of the cookies using scrapper immediately after removing the cookies from the oven.
Allow them to cool on a pan until the bottom is set, and then transfer to a wire rack.
Serve at room temperature.