I have to cook for one and soda bread is better for my diet. Can it be frozen once baked, or in dough form so that I don't feel I have to pig out!?
Soda bread is a simple quick bread, all of which freeze quite well after being baked (most yeast raised breads do as well).
Wrap it well to prevent freezer burn—I like to use a large sized freezer-rated zip type bag for freezing breads.
You can also put some waxed paper or parchment between each slice to help you get them out without thawing the whole loaf.