Preheat oven to 500 degrees. Mix all the dry ingredients together with a fork. Cut in the butter. Fold the buttermilk into the flour mixture until just blended. Make dough balls from rounded tablespoon; coat with flour. Place floured dough balls in greased cake tin. Drizzle some melted butter over the top. Bake for 5 minutes at 500 degrees. Turn the oven temperature down to 450 degrees; bake for 15 minutes. Let rest for 5 minutes before devouring the whole pan of biscuits.