I'm so jealous of your problem
my DC won't eat anything "mixed together" and these mixed dishes are my favourite.
I love a Thai curry, Chinese style curry or Indian curry. I put potato or sweet potato in, protein and lots of veg so it is a meal in itself.
Love a chunky soup. Minestrone, taco soup, curried lentil soup, chunky leek and potato, lentil and bacon. So many options.
Stew. Beef stew with dumplings is the best. Yum. Really any stew with dumplings in it though.
Sausage casserole, cowboy pie, spaghetti and hot dogs, hoover stew, spicy sausage stew, sausage and prawn jambalaya, loads of things you can make with sausages or hot dogs.
Mince you can do so much with. I do a pork mince and prawn jambalaya sometimes, mince and potato stew, mince curry, stuffed cannelloni, Bolognese pasta bake, slow cooked meatballs in a chunky vegetable sauce.
Got to love a stir fry too. Especially one covered in delicious satay sauce. Or a sweet and sour.
Because I like my food mixed up and my kids don't I quite often cook the components separately for them, and then Chuck it all in a pan or wock for what I'm feeling like having. If I'm having rice with something I like to do that so that all the rice is evenly mixed with the curry sauce or whatever, I usually Chuck a handful of extra frozen veg in to, like peas, sweet corn, soffrito or diced mixed veg. Just ups the veg content without and sad cold broccoli florets on the plate next to it. Shredded cabbage is excellent for this because it's so easy to throw into a stir fry or stew and also really good for you. I also keep frozen cut peppers and lots of cut up chilli, herbs, garlic and onion to make cooking quick flavourful meals more quickly.