Had this for dinner last night. Paired it with some tortilla chips to help round out its nutritional value. Might do it again tonight. It's called The Mediterranean Diet.
Beans are cheap and if you just want nutritional value they hit both carbs and protein in a great amount per ounce. Of course there's the studies showing regional genes benefit more from specific macro sources over others (IE an Asian would utilize rice glycogen better than oats), but if you want to hit the basics: beans