I've looked into these:
Ingredients:
2 cups uncooked calrose or other medium-grain “sticky” rice
1½ cups water
8 ounces bacon
4 eggs
2 tablespoons liquid amino acids or low-sodium soy sauce
brown sugar
salt and grated parmesan (optional)
They are rice cakes and you can find many versions if you google Dr. lim's. They're popular with endurance bikers.
Another option along the same line are masubi, which are rice topped with a piece of meat (usually spam) and wrapped in nori (seaweed).
Shelf life may be an issue if you are talking more than a couple days but great for hard 1 to 2 day trips.
On our long days I usually make bagel sandwiches with salami and cheese. I use a sandwich bagel which is not so dense. I also crave citrus when at altitude so grapes or already peeled oranges come along most of the time though I can cure that citrus crave through energy beans if I need to. When packing longer distance I'm with the rest here: ramen, rice, potatoes and oatmeal, just bring some spices. Also those rice/noodle packs you find 10 for $10 are a much cheaper option. I sealed tuna pack and a broccoli/cheddar noodles or rice can be had for 2 bucks.