Breakfast is normally the same thing (no sugar added hot cocoa or tea with yogurt) and I have a few options I rotate for lunch at work (frozen meal, sandwich, or veggie burger with fruit/veggies and a dairy like string cheese or yogurt...peanut butter also frequently makes an appearance because
yum).
Dinner is much more varied, but only because I eat that meal with my husband who can't stand repetition. I, on the other hand, could probably subsist off of a handful of foods until the end of time.

He thinks I'm a weirdo, but I've always been this way and was, until I moved in with him and adopted a lot of his eating habits, quite thin. So I've returned to my boring repetitive eating habits and the weight has been gradually coming off.
I'm sure this isn't the solution for everyone, but for me it takes a lot of the stress out of meals when I've got a plan.