Preheat oven to 375° F.
If not using buttermilk, mix milk with 1 tablespoon apple cider vinegar. Set aside to curdle.
Blend together gfJules Flour, sugar (if using), baking powder and salt.
Cut in the butter with a pastry blender or two butter knives until the mixture resembles a pebbly, course meal.
Add baking soda to milk mixture, then stir into dry mix with egg white and additions (raisins; seeds; cheese; herbs, etc). Mix with a fork or paddle mixing attachment until integrated.
Scoop dough onto a floured (with gfJules Flour) counter or pastry mat and roll into ball then transfer to a lightly oiled and floured (with gfJules Flour) 7-inch glass bowl or 6-8 inch cake pan. If needed, wet a rubber spatula with water and smooth the top of the ball of dough. Sprinkle lightly with gfJules Flour, then make a cross in the top with a large knife.
Bake for 40 minutes or until a toothpick inserted into the center comes out clean. Remove to cool on a wire rack before slicing.
** Please keep in mind that nutrition information provided is per serving, which may vary. While we have taken care to provide you with the most accurate nutritional values possible, please note that this information may differ significantly depending on the exact ingredients and brands that you choose to use to make this recipe. Additionally, where options are given for ingredients, the resulting calculation may include all ingredient options instead of only one per line, skewing the totals significantly.