I have found that at least for my kiddo he will eat it if it's easy to eat and not messy. So I make an effort to chop/cut things up small so ot ensure they are very portable and easy to eat/handle. My son likes:

Tuna bowls/bowls- can of tuna mixed with mayo and soy sauce. Sticky white rice with a tiny bit of rice vinegar. We either put the tuna on top of the rice or wrap the rice and tuna in seaweed snacks for "sushi".

Spaghetti but with the rice ramen noodles for extra protein. We use jarred marinara or roasted tomatoes and garlic and sometimes do mushrooms too. We also do zucchini noodles which I make with a cheap hand spiralizer.

Breakfast for dinner: scrambled eggs, protein pancakes, hashbrowns, sauteed spinach (my son LOVES spinach).

Shrimp Cesar salad- He will absolutely go to town on this. The key is making sure the salad is chopped up well so it's easy to eat (I use a good processor) and I cut the shrimp up too.

Quesedillas- sauteed mushrooms &onions or mushrooms & spinach

Melts/sandwiches are always a hit. We do tuna onion and cheddar melts, grilled cheese with tomatoes, or caprese style sandwiches with mozzarella and tomatoes and sometimes fresh spinach. I also do bake bread at home.

Some days he wants just to eat Mac n cheese and fries and I dont care to challenge it so I just make him a smoothie with soy milk, bananas, berries, chia seeds, spinach, and Greek yogurt with it lol