I'd like to introduce you to an old college favorite: beans and quinoa. Actually, this is beans and couscous, as I was out of quinoa. Either grain works well. It's yummy, nutritious, cheap. The frequency with which I ate this is alarming to consider, but I was the poster child for Broke College Kid.
You can adjust this to make as much or as little as you want. You can also use the leftovers to fill burrito shells. This particular recipe made about three servings.
1 can beans
1 small can corn
1/2 red onion
1/2 green pepper
1/2 jar of salsa (Trader Joe's has the BEST sweet but spicy salsa... Salsa Autentica!)
Couscous prepared according to package
Dice and saute onion and pepper 5 - 7 minutes.
Add remaining ingredients and heat through.
Serve over grain.