Hmm.
Cheesy Rice is amazing, and if your kids are open to trying new foods, (or even not, if you can get them to try a few bites,) might go over really well. It's basically homemade mac-n-cheese, but with rice, which I feel first of all tastes better, and second of all, then you aren't fighting "but this isn't mac and cheese" because it's cheesy rice. You cook rice in water (brown rice works great too) (and some milk would be good too), and mix in milk, lots of butter, salt and pepper, and LOTS of shredded chedder cheese. Then you pop it in oven until its hot and golden.
(you can make a big batch and freeze it before putting it in the oven, then take it straight from freezer to oven if it isn't in glass. a good way to freeze it would be to line a good cooking and freezing pan with parchment, freeze it, then take the parchment out and put it in a baggie in the freezer when it's frozen into shape. when it's time to cook it, pop the paper and rice back into the same pan, and cook.)
I don't really know what constitutes kid friendly soup, I think kids often just take being exposed to a food 10-15 times before they will "like it". however, I think butternut squash soup would go over well because its a bit sweet. (It's also easy and nutritious!) You roast a butternut squash, saute a sliced onion and apple in olive oil or butter, scoop the squash into a pot with the onions and apple, add stock, and simmer for 20-40 minutes. add salt and pepper, and puree. add more stock to thin as nessicary. it's super yummy, and even better with a dollap of yogurt on top of each bowl. (and that adds pro-biotics.)
how about veggies (like carrot sticks, lightly steamed (just til it's bright green) brocolli, and other veggies) with salad dressing and aoili as dipping?
I personally feel that a pb&j sandwhich, if made with natural unsweetened peanut butter, and whole wheat bread without hfcs or other stuff like that, and jelly that is only sweetened with organic cane sugar, or honey, or something, is pretty good. Sure the jelly is sweet, but you've got a complete protein, it's easy, it's transportable, it's kid friendly, and pretty low sugar. if they don't like them like that maybe you can slowly transition one element, or do half skippy type peanut buttter half natural etc til they're used to it?
For a healthier version of chicken nuggets, I think I've seen a lot of versions of those around the internet that are homemade and healthy. I imagine breaded peices of chicken could be baked or pan fried and that would go over pretty well with ketchup.
HTH and welcome.
