Preheat oven to 475°.
In a mixing bowl, combine flour, baking powder, baking soda, and salt.
Cut cold butter into flour mixture using a pastry cutter, until a coarse crumb mixture.
Stir in buttermilk until just combined into a shaggy dough.
Place dough onto a floured surface. Pat flat and fold 3 times. Then flatten evenly to about 1/2 to 1 inch thick.
Cut out as many biscuits as possible. Reform and flatten the remaining dough. You will cut a total 5 biscuits.
Butter a cast iron skillet. Transfer cut biscuits into the skillet.
Bake for 11-15 minutes, until golden brown.