Preheat oven to 350F and line a baking sheet with parchment paper.

Combine all dry ingredients and stir together. Add buttermilk and mix with a large spoon until the dough comes together. You might need a little more or less buttermilk, depending on the weather. The dough should be moist but not so sticky that it is hard to handle.

Shape into a round and place on baking sheet. Cut an “X” into the top with a sharp knife, dust with flour, and bake 45 min., until bread sounds hollow when rapped.