ITA with burrito, fried rice, and crockpot suggestions.
You can make breakfast burritos too - great for quick AM before class/on the way to class...
A crockpot will also give him access to stuff like beef stew, which is easy, flexible, and freezeable. Although, if he's a college boy, maybe "freezing the leftovers" isn't something we need to concern ourselves with.
If he learns how to properly roast and carve a whole chicken at that age he will be ahead of 99.9% of his friends and at some point, will seriously impress a girl
Rice cooker - can bulk anything up with rice. We used to add rice to one can of soup for 3 hungry college kids.
Teach him to make quick one-pot mac and cheese.