T-Rex: Why is granola the only foodstuff offered in bar form? We should be adding honey to OTHER foods, blending them, pressing them into bar form, cooking them...
T-Rex: ...and wrapping 'em up for convenient snacks on the go!
Dromiceiomimus: I mean - we already do. What are biscuits but portable flour and water? What are onigiri but portable sushi? What is a burrito but a portable meat salad?
T-Rex: "Meat salad" sure is a phrase.
Dromiceiomimus: It sure is!
T-Rex: And meat salads are delicious, even - or ESPECIALLY - in tube form!
Utahraptor: They sure are!
Utahraptor: But to answer your question: there's a whole class of foods in bar form - fruit, chocolate, protein, energy, ration, etc - and as is SO often the case with these "why isn't anyone simply doing x" questions, the answer is that they are, you're just not aware of it.
T-Rex: Wow! Why isn't anyone simply being NICE TO ME, Utahraptor??
Off panel: Because I care more about your commitment to truth and bettering yourself!
T-Rex: Oh yeah!
T-Rex: ...I forgot about that dang ol' commitment