M.R.
If you don't mind spending about 30 minutes on a Sunday assembling meals for the week, you'll find that you can make a great variety of healthy, nutritious food that your son will enjoy.
I would make cups that consisted of whole grain rice or pasta, finely ground turkey or shredded chicken/pork, assorted frozen veggies, and a sauce. With these simple ingredients you can make a ton of different meals:
-spanish rice, taco meat, corn or mexi-veggies
-brown rice, chicken, green beans, gravy
-pasta, ground turkey, broccoli, marinara sauce
-pasta, shredded chicken or pork, mixed veggies, italian dressing
Get creative and the combos are limitless! Continue to include the fresh fruit and you have a wonderfully balanced meal for your child. You have the opportunity to switch things up, introduce different grains/veggies/meats, and really expand his palate.
The best part? You do all of this in one afternoon and then during the week when you're busy and tired from working, you come home and pop it in the microwave. The daycare providers will love the ease of these simple meals too.
Good luck!