My cereal of choice is Grape Nuts with sliced banana. Is that dull enough?
Weird name to use; even if you want something biblical, there are probably less offputting references to bread.
Bananas in particular are pretty high in sugar, and other than potassium their nutrient density is nothing special.
Also, their nutrient density is perfectly fine. It’s high in fiber, potassium, vitamin C, and vitamin B6.