Do you need some go-to things with only rice or potato based starches?
I've done that kind of hotel cooking, btw.
Crockpot Spanish Rice-- brown rice, salsa, black beans and corn. Can top w/ cheese if you're feeling saucy.
Microwave lentils, sausage, and carrots-- just like it sounds-- salt after cooking.
Corn tortillas and cheese and tomato paste == mini-pizzas. (yeah, I know-- but it works in a pinch)