Make it a variety of snacks! My son loves applesauce pouches, cheese, eggs, or goldfish and graham crackers if you’re okay with something less healthy
@JL they wont heat so I send him the lunch in a thermos.
Cut up some strawberries, tangerines, blackberries. Drizzle some maple syrup on them. Not too much and then dice up a potato and fry it with olive oil. Not too much then add a pinch of salt. You can add some shredded cheese on the side or ketchup for the potatoes
Have you considered making food ahead in batches and sending it? Also, do they heat food up or does it need to be straight from the fridge?