Shepherds pie is a good go-to here as well, and we also do cowboy pie which is the same but with baked beans and Worcestershire sauce instead of carrots. I always make my mash topping with potato and sweet potato too, to get a few more vitamins in!
Others are spaghetti bolognese (I put it through the food processor which makes the texture better for the little ones), sausages with pasta and sauce (chopped tomatoes, courgettes, peppers, basil, garlic and oregano - put it through the food processor before serving), chicken curry (annabel karmel), homemade fish cakes.
We are dairy-free these days, but good standbys used to be lasagne and chicken and butternut squash pie (cooked chicken, cooked butternut squash, cheese sauce, topped with mashed potato).