I'm not a fan of prepacked meals (e.g. Mountain House) - every one I try is too salty, and most are too small.
For an extended hike in Alaska (bear cans mandatory) I made a spreadsheet of non-refrigerated foods and ranked them according to calories per gram and per ml, plus things like protein content and vitamins. As I recall peanut butter ranked very high, and so did dry salami. Cooking oils also scored very well on cals/ml and cals/gram, though not so great in protein. I portioned out all my meals in advance, with a goal of 3000 Kcal each day, not counting snacks. A typical lunch or dinner would involve some starch (freeze-dried potatoes or instant noodles or instant rice), mixed in with some protein (dry salami), and liberally sprinkled with extra fat (corn oil). Breakfast might include oatmeal with powdered milk and sugar, or eggs (from powder), or pancakes (flour, powdered milk, powdered egg, oil, water). Snacks would include peanut butter in a squeeze tube. (It doesn't taste great after a day or two, but after a week of hard hiking with a heavy pack you will be truly hungry, and you will crave it. I also had a smaller tube of fruit jelly, which made a fine accompaniment for the peanut butter while it lasted.)
Note: powdered eggs were usually disappointing - either soupy or burnt or both. There's an art to getting the proportion of water right and applying the right amount of heat. But we were too hungry to mind.
I carried salt and pepper; feel free to bring a variety of spices to suit your taste.
When not quite so space-limited, cheese is a favorite - can be eaten raw as a snack, or as an ingredient in dinners. Hard-boiled eggs should last several days, if not cracked, and are similarly versatile. Beef jerky is an enjoyable snack, though hard to chew, and salty.
I usually carry something salty (e.g. salted peanuts) in an accessible pocket, in case of hyponatremia. I also carry some kind of candy, as a quick pick-me-up.
I'm not a huge fan of tortillas, but they do fit into a bear can quite nicely. Add some cheese and some freeze-dried meat, maybe some dried onions and peppers, and you've got a quick and tasty meal you can prepare on a campfire-heated rock.