You can buy modern high calorie food bars that will last ten years and contain 3000 cals in a tiny package, but they're mostly carbs. Again, great for survival but not something to live off of while on a fun trip in the backcountry.
I usually pack precooked meats (frozen if needed), dried meats, firm biscuits or crackers, and some nuts and fruit. Granola and oats are good too of course.
If you have conveyance (a canoe or kayak, an atv, etc) then you can afford to bring much less dense (and usually better tasting) food.
Can confirm, many years ago went on a canoe trip on the Shenandoah for a week and we brought about 400lbs total food and equipment per 2 man canoe. We ate like kings, and mine and my boat-mate's canoe was the only one that didn't capsize on the trip (everyone had fully waterproof bags, so no one lost anything, it was just a matter of pride).
or Mealsquares: https://www.mealsquares.com/
The Logan bread was tastier, though the Mealsquares are really pretty good just a bit dry.
Unfortunately the beans and cabbage hardly sound appetizing for a bread. The obvious ideas are wheat, nuts, and dried fruits.
Any good resources for this?