I tend to give DS chicken nuggets/fish fingers (you can get some semi-decent ones) and frozen vegetables, either the steam fresh bags done in the microwave (these are nice) or the bags of carrots, brocolli and cauliflower which you do in a pan of water. (less nice but edible, not like the bleugh vegetable mix you used to only be able to get)
Or the mini pizzas you can buy in supermarkets, and let her put her own toppings on, things like peppers, sweetcorn, ham, or whatever she likes and then top with extra cheese to hold it together.
Pasta with a jar of sauce or tin of tomatoes/passata if they don't like bits, you can add things to this too like mushrooms, peppers, onions, garlic, sausages, chicken, or veg cooked in with the pasta - sweetcorn, thinly cut carrots. Just fry the chicken/peppers etc in a small frying pan or saucepan, cook the pasta (and possible veg) at the same time, drain the pasta when it's done and mix all together in a medium sized pan with the sauce or tomatoes, stir over a low heat for a couple of minutes.
In DS' most fussy phase he was having just chicken, tomatoes and pasta, but he loved it. You can even make a large portion and then add herbs, garlic and chilli powder for adults later and call it Chicken Arrabiata.