Preheat oven to 375 degrees
Sift 3 cups of flour through a fine sieve or whisk to incorporate air
Add all dry ingredients to bowl of mixer, and mix until combined.
Make a well in the center of the dry ingredients and add buttermilk, stir a few times, and repeat with the egg and butter. Do not overmix.
Add in the craisins, give a few stirs and put batter into a cake pan prepared with cooking spray
Bake on 375 degrees for 10 minutes, remove from oven and lower to 350 degrees.
Cut cross in top of soda bread, brush with egg white and sprinkle with sanding sugar if desired
Bake at 350 for 30 – 35 minutes, removing as soon as a cake tester or knife comes out clean