Slice the butter and place them in a large bowl. Combine sugar, salt, and flour with butter, and mix until a dough is formed.
Place the dough on a parchment paper, place another parchment paper on top of the dough, and roll it from left to right, rotate 90 deg, and roll again to a rectangle-shaped dough slab with 1/4th inch thick .Adjust the sides to get straight and smooth edges.
Cover and chill the rolled dough for at least 2 hours.
After removing the top layer of parchment paper, using a cookie cutter of your desired shape, make the cut out of the dough and refrigerate for another 10 mins. You can sprinkle sugar on the slices if needed.
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.