I like to keep my camping food cheap, simple, light, compact and tasty. I usually use 65g packs of instant noodles, which only need 200ml of water to rehydrate them, and I and use three per day. Obviously you don't get that much flavour out of the flavouring sachets supplied with them so I always add extra ingredients to "bump up" the flavour, and nutritional value too. Half a Knorr Chicken stock cube does wonders on it's own, but I also add some mixed herbs, mixed black and white pepper and some fried onions too.
However, the energy content of instant noodles isn't that great (about 150kcals/100g), so recently I have started adding some vegetable suet (815kcals/100g) to increase the energy content...It doesn't need much..1 Teaspoon is enough, or the noodles will be too greasy, making the inside on my pot harder to wipe clean afterwards.
And even more recently I discovered "well matured cheese power" from Taste Sensation (£7.95 for 500g, inc. postage.). It lasts for at least a year from the purchase date without refrigeration, offers a lovely cheesy taste, and 550kcals/100g...Again, 1 teaspoon of it is plenty...It's powerful stuff.
I went back to their site earlier and discovered they do pretty much every type of veg out there in powdered form...Beetroot Carrot, Brocolli, you name it, they have it, so I may add some more powdered ingredients to the list later.