From my experience in mountain marathons, my favourite superlight / minimal cooking required menus are:
Dinner
Plain couscous with (rehydrated) freeze-dried vegetables and onions, grated cheese and chopped salami, olive oil to taste; or
Smash with (rehydrated) freeze-dried onions, grated cheese and chopped salami
Instant custard with 3 or 4 broken up gingernuts
Breakfast
Pop tarts (oh yes)
Multivitamin tablet
Food and drink for the hill (to be consumed little and often)
Muesli bars
treat-sized Mars or Snickers
Tangfastics / Jellybabies
Water with electrolyte powder added (I like the SIS Go ones best)
Lunch
Oatcakes, snack-sized cheese stick, branston pickle
Drinks
Instant coffee with powder milk and sugar already added
Hot chocolate
Don't forget the salt and pepper, it can make a huge difference to how dinner tastes
You get sick of sweet stuff on multi-day trips, but it's the easiest way to get the calories down. I remember halfway through one long trip someone produced oatcakes, cheese and pickle one lunchtime - there was very nearly an ugly scene as the rest of us choked down yet another muesli bar each. Hence why I often carry "Lunch" as well as all the hill food.
HTH
Rat