Preheat oven to 350 degrees and grease a 10″ cast iron skillet or a 9″x4″ loaf pan.
Stir together all dry ingredients in large mixing bowl.
In a separate bowl, mix all wet ingredients.
Make a well in the center of the dry ingredients. Pour in the wet ingredients and mix until just incorporated.
Transfer batter to the prepared pan and sprinkle with additional white chocolate, if desired.
Bake for approximately 40-45 minutes for a cast iron skillet, 50-60 minutes for a loaf pan, or until a toothpick tests clean. (Check a bit early as all ovens vary. This will prevent a dry baked good due to overcooking. If the top is sufficiently brown but the center is still not cooked through, lightly drape a piece of foil over the pan and continue cooking.)