Here are two videos about a professor growing three staple crops and a vegetable patch- there are links to scientific papers as well. Favas, Wheat, Olives, and vegetables. You could theoretically get the vegetables by foraging. Hereabouts you would need a different oil crop than olives. Perhaps sunflowers or some kind of tree nut such as pine nuts, walnuts, or hazelnuts. Wheat and Favas grow great here though I would probably need to be able to fence out or control the local Hungarian partridge population to grow a small wheat plot successfully.
I think it is also extremely important to grow foods you know you eat and like. That doesn't mean you can't learn to like new ones- but if you like potatoes grow potatoes! I think the staple foods I grow best and accept best both culturally and comfortably are beans, peas, wheat, corn, and potatoes. For vegetables it is probably sweet corn, squash, and tomatoes. I haven't successfully grown oil crops for oil but can grow good crops of sunflowers- just haven't processed them into anything. I grow Favas but don't actually eat them- at least not yet. Trying new foods is a very slow process for me personally.