I can really relate and sympathize. This is a crappy situation to have to deal with, to try to sneak a snack under the desk, and it has to be portable, nutritious, quick to eat, and not messy or fragrant! and I myself wouldn't chose to eat in the bathroom. There are many uncaring employers who don't care if you have a law-alloted break, and one can feel subtly intimidated if you ask for what's due to you. Best wishes to you
My 'go-to' breakfast, if it has to last me, is Eggbeaters (or store brand substitute) with some extra protein, like leftover cooked chicken; and as many veggies as I can get in the pan.