1cupbuttermilk + extra for brushing the topsif desired
Preheat oven to 450 degrees F. Line a baking sheet with parchment paper and set aside.
In a large mixing bowl combine the flour, baking powder, baking soda, sugar and salt. Cut in the butter until you have coarse crumbs. Stir in the cheese, ham and green onions. Stir in the buttermilk just until combined.
Transfer dough to parchment lined baking sheet and shape into an 8" circle. Cut into 8 wedges. Brush each with additional buttermilk if desired. Bake for 15-20 minutes or until golden brown. Let cool slightly before re-cutting into wedges.