I'm on a pretty strict diet (most of the year if I'm not slacking) and have to eat 4k calories or more during hunts to not lose too much weight. I make my own trial mix with stuff from the local health food store; peanuts, cashews, dried cranberries, apples and raisins. I haul alot of canned stuff at times; canned ravoli, canned corn, bush's baked beans, chilli. Metrx protien bars in the apple pie flavor are really good. Peanut butter and granola bars go really well together. This year I'm gonna try something new. I'm gonna use a little bit out of peanut butter in a jar and fill it with honey. Mix it up and eat it with a spoon. It should last a while and be packed with calories. I prefer skippy's natural peanut butter when it is on sale. I haul hard boiled eggs sometimes. Ive divvied up bread, pb, and jellly before too between two guys. That goes over pretty well. I make jerky in the summertime, but not too much is left over for late season hunts.
I used to catch a lot of flak from hunting buddies about hauling canned corn. Most of them have hauled it since.
I try to eat stuff that lasts a while. I rarely unpack my hunting pack during hunting season. Its easier if I can leave canned food in there and use it next time. Eggs are bad to forget about, but they are really cheap especialy for protein.