What about oats and an assortment of nuts? These go pretty well with cold milk or hot water alike, and you can flavor any which way if desired. Or are oats in the US also "fortified" with sugar?
I really just want to check the "morning nutrients" box without having to do a lot of bother, its something I really don't want to care about or pay attention to. I just want a very fast, convienient breakfast without added sugar and that's not available in a lot of stores, which is crazy.