Just a different spin on this subject as I did something earlier this year that threw my hiking menu for a loop - I got braces. So things in the past that I relied on - sandwiches, fruit, balance bars and the like, hard candy and beef jerky are now big no-nos. Here's what I ate last Saturday that got me up and down the mountain:

Breakfast (such as it is at 2:15 am - does not count towards hiking weight)
2 pop tarts
Starbucks doubleshot + protein
Odwalla OJ

3 fruit and cereal bars
3 Gu's
Naan bread
Jif Peanut Butter pack
snack pac pudding

I use Nuun for electrolytes so they hardly count towards weight and calorie counts.

So that adds up to a little over 2000 calories. I did not weigh it but it's not that much. Enough calories to get me up and down the mountain (just under 200 lbs).

I have tried fruit pacs and the like and while they taste good, they are not very calorie dense.