My 17 month old has a bottomless pit for a stomach and eats more than my 4 year old. I try to include a good serving of protein at every meal and my go-tos are...
Eggy bread, plain or with either mashed banana or pureed spinach and cheese added to the egg mixture.
Egg fried rice (leftover rice, egg, peas/carrots/sweetcorn/pepper/mushrooms/any other quick cooking veg, fried in a bit of oil plus low salt soy sauce and garlic granules).
Soup with toast for dipping - tomato, sweet potato, leek and potato; add lentils or chickpeas for protein.
Pasta with salmon and creme fraiche, tuna, tomato, pepper and onion sauce, or bolognese style sauce.
Kedgeree, which I would normally make with smoked haddock but too salty for a little one, so I use plain haddock with a bit of smoked paprika, turmeric and garam masala. Add frozen peas for veg.
Meatballs, either made with mince, or with chicken breast whizzed in the blender with a handful of grated parmesan. With pasta plus tomato sauce, or with potatoes or rice with whatever veg on the side.
Mild chicken curry - fry chicken breast in garam masala, add tomato puree, chicken stock, coconut milk, mashed mango.
Beef stir fry made with thin cut beef steak cut up small, red pepper, sugarsnap peas, sweetcorn, carrot, a bit of soy sauce and garlic and honey.