Mix flour, sugar, baking power, & salt. Cut in butter until pea sized pieces. Add in cold buttermilk and form into a ball. Roll into a 6x9 rectangle. Cut into thirds. Stack each third on top of each other and roll into a 6x9 rectangle again. Try not to overwork the dough. Cut using a 2 1/4 inch circle cookie cutter. Bake at 450F for 10-12 minutes.