In a medium-sized bowl, mix the dry ingredients together until combined and fluffy ( I do this with a whisk, it almost acts like sifting but is quicker). Then, cut the chilled butter into chunks and add to the dry mixture. Cut the butter chunks into the flour mixture as you would biscuits or pie dough. Pour in the Buttermilk and carefully stir until combined. Then, add your fresh fruit, and nuts if you want them. (For a fun fall scone add cranberries, walnuts, and some orange peel.) Pat into a circle and cut into wedges, separate wedges slightly. Brush with a little egg white and 1 T. milk or cream, then sprinkle with coarse sugar.