Firstly, mill the flour. Then set it aside in the fridge to cool.
In a small bowl, combine sugar, buttermilk, egg, vanilla, and orange zest. Mix to combine wet ingredients.
Once the freshly milled flour has cooled a bit, whisk in the baking powder, baking soda, cornstarch, and salt.
Put the cold cubed butter into the flour bowl, and use a pastry cutter or two forks to cut in the butter cubes into the flour until it it reaches a gravel texture. You still want some pieces of butter in there.
Pour the wet ingredients into the dry ingredients, and stir until just combined. Make sure there is no dry ingredients left, it should all be moistened. Then, rough chop the cranberries
Then, fold in the cranberry pieces.
Lightly wet or oil your hands, and start to work the dough into a ball. Then, cover and let sit for 15 minutes so the fresh milled flour has time to absorb the liquids.
Preheat the oven to 375*F. Prepare a baking sheet with parchment paper.
After the dough has rested, press the dough on the prepared baking sheet into a 1 inch thick disk. Should be about a 7-8 inch diameter circle.
Using a bench scraper or large knife, cut the the circle into 8 equal wedges. For scones with a softer, higher rise texture leave the scones in the circle. But, if you want crispier, firmer edges, then separate the wedges at least 1-2 inches apart to allow for the to spread while baking.
Prepare the egg wash with 1 egg and 1 tsp of water mixed together.
Brush the tops with an egg wash.
Bake for 18-25 minutes, or until golden brown, and baked through. (watch closely, overbaked scones will be dry!)
Remove scones from the baking sheet, and onto a wire cooling rack.
Prepare the cranberry orange glaze, set it aside to wait until the scones have cooled at least 10-15 minutes before drizzling the cranberry orange glaze.