A vast subject, and depending upon the objectives and length of your trip, almost anything will work. I tend to favor oatmeal with fruits and various flavoring, good quantities of nuts and dried item like jerky and raisins. A good soup can really hit the spot. Sometimes your cook kit can be quite basic, so that you will be heating water and adding it to all kinds of things; at the other extreme you can carry portable ovens, etc. and undertake to fabricate baked goods and produce all sorts of delicacies.

A lot of things right from the supermarket do well in the woods (dehydrated potatoes, freeze dried fruit snacks, good old mac and cheese, as well as other pasta items). While more expensive, freeze dried meals usually work quite well.

Basically, take whatever appeals to you at a price and weight that you can tolerate, and items that don't overtax your culinary abilities. Fortunately we are pretty capable omnivores.