There are so many meals in a day. Sometimes a few meals need to be on the go. But that doesn't mean they have to kill you (see: fast food).
Many people will skip breakfast if they can't take it to go. That's why frozen bananas and protein powder are so valuable. When I make this shake containing rice milk, frozen banana, frozen blueberries, and protein powder, my wife thinks she's getting a real milkshake. The best part is, it actually makes her day. More energy, more taste, less "ooooh, I really shouldn't have had that milkshake" feeling.
Once again, I don't write recipes, I encourage technique. Tweak the amounts on those ingredients and find the consistency that works.