Vitamins?

These are pretty much the only things I eat: begals with low fat cream cheese, skim milk/water/apple juice, home fries, eggs, cheerios with brown sugar, mashed potatoes, some form of chicken usually baked, preztels, saltine crackers. Id say whatever I eat 95% of the time it will be something from that list because most of that stuff is free at work =), is it unhealthy to eat the same things all the time? Are there vitimans and minirals that im probably missing? What vitamins and minirals should I be getting more of?

Thanks everybody!