"Bob: What do you do for (calorie) dense breakfasts?"
Well, everybody is different, and everybody wants different food. While backpacking, my breakfast priority is more for warm liquids that will warm me up and fill me up temporarily rather than calories to last me for a whole day. I'll carry a couple of bags of f.d. fruit, so I splash some hot or warm water over a bowl of fruit pieces, then squeeze a packet of GU over that. Then I have a small energy bar baked from one of Sarah's recipes. Then I have a bowl/mug of coffee or coffee/cocoa mix. By the time I have all of that down the hatch, I have already packed up the rest of my gear, and I am almost ready to hit the trail.
If I have been out long enough that I feel like I might be running low on calories, then I add in one more breakfast item. It is some powdered milk-based diet drink. It is not super heavy in calories, but it has some calories, protein, and a bit of fat, and that keeps me going.
So, my priority for breakfast is more liquid. My priority for mid-day snacks is fruit leather and whatever comes in a Clif bar wrapper. My priority for dinner is calories.