I'm an expert on 30 min or less healthy meals. I have a full time job and 4 kids. There all time favorite quick and easy meal is spagetti. Then there is a rice and chicken dish. Use a 9x13 pan as long as you don't mind leftovers, otherwise half size this. 4-6 boneless skinless chicken breasts rice and 2 cans cream of chicken or cream of mushroons.
I put about a half inch of uncooked rice on the bottom of pan then mix in the cream of whatever soup you use and enough water to barely cover the top. You can sneek in some vegetables here without notice. If you use broccoli don't keep for leftovers. Mix well. Put the chicken on top and season to tast. Bake at 400 for 30 min.
Pancakes are great for breakfast especially if you use the just add water and a fruit topping. Take some fresh or froxen fruit cut into little pieces and put in a small bowl. Smash with water and a teaspoon of sugar or less. But leave a few pieces large. If your son likes to dip things then make silverdollar pancakes and give him a spot of the sauce on his plate.
For lunch my children love quesadillas. Its just 2 tortillas with cheese and whatever else you like to add. I always use salsa with it. You can bake it at 350 for about 10 min. or microwave for 1-2 min. They are always better baked. Cut into bite sixe pieces and serve.
If you don't own one I highly recommend a crockpot. You can start dinner before you go to work and it will cook while your there.When you come home dinner's ready.
It great for homemade soups and stews.
If you need a great tasting dessert try slicing some apples into a baking dish and adding cinnamon and sugar. Bake for about 20-30 min at 350. Its sort of like applesauce. You can also use the sliced apples add a white cake mix put about 5 pats of butter on it and add cinnamon on top. Bake 350 for 30-40min.
You can use the chicken rice dish with pork chops.
My children where not big meat eaters until about 2 years or so. Lots of pasta dishes are great for his age. Lipton makes a really good packet pasta. Alfredo has always been a favorite here.
Eggplant parmagian is also quick and easy. I made it for my family and the neighborhood children came over and also liked it. I served it with some spaggetti squash.
My favorite recipe site is allrecipes.com you can look up one ingredient and it will give you a long list of recipe choices.
Most Importantly, don't forget that he needs more fat in his diet than you or I.