I think granola bars would be the best option. With a bit of preparation time and planning, you can make them easily at home. Try preparing granola bars for a healthy dose of protein and a healthy alternative to high-fat snacks.
However if you don’t have enough time to prepare them at home there are companies that offer readymade snacks that include granola bars – http://www.sheffafoods.com/blog/healthy-snacks-and-bars/the-drama-behind… as well, which are full of nutrients and flavor! Their products are natural and delicious too. I am sure you will love them.