Preheat oven to 375°F.
Place dry ingredients in a bowl and whisk to combine.
Add egg and half of the buttermilk. Stir to combine. Continue adding buttermilk a little bit at a time while stirring just until dough holds together.
Form into a 9" circle with the dough and cut a cross shape 1/2" deep into the top.
Bake on a parchment lined pan 45-50 minutes or until lightly browned and hollow sounding when tapped.
(Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.)