Preheat oven to 425.
Whisk all dry ingredients in a bowl
Cut the cold butter into the dry ingredients using a pastry blender, fork or your fingers until it resembles pea sized shapes.
Pour the buttermilk into the bowl. Slowly mix in the buttermilk using a fork until the dough forms into a lumpy ball. The dough should be loose. Don’t over mix.
Wrap the loose dough in plastic wrap. Refrigerate for 30 minutes
Roll out dough on a silpat with a dusting of flour to keep from sticking into 1 ½ inches thick
Cut the dough into 6 pieces using a round cookie cutter. Place biscuit rounds onto baking sheet. Brush remaining buttermilk on tops of the biscuits to ensure a golden brown top.
Bake for 150 20 minutes or until golden brown.