My breakfast is muesli, soya yoghurt and fresh berries, so not really high in protein or portable.
I like adding a spoonful of pumpkin seed butter to my smoothies, gives it a bit of a richer texture and I can't really taste it that much (I do like it on it's own though, so it might stand out more for someone who doesn't like the flavour).
You could cook up a chicken breast when you're making dinner the night before and have that for breakfast, either on it's own or in a sandwich.
I'm also a fan of having protein shake in the cupboard for when I don't have enough time to get food. Don't think I'd want that for breakfast everyday, but sometimes it's a better alternative than what you can pick up at work. I've got some tupperware cups and I just put a scoop in that and add water when I'm ready to drink it. Last advice I read on protein shakes was to go for one with at least 20g of protein and the same amount or less of carbs.