I don't do this, but veggie ideas that also keep/freeze well:
veggie lasagne - you can vary by sometimes doing spinach and ricotta, sometimes a tomatoey sauce
big pot of vegetable and bean stew (can be more 'red/yellow' with red peppers, pumpkin and tomatoes, or more 'green' with green lentils, broccoli and courgette)
potato gratin (layers of potato with well-browned shallots and cheddar sprinkled between)
vegetable crumble (veg/bean stew as above, baked with crumble topping, made as usual but without the sugar)
Simple non-freeze meals:
Potatoes (boiled or jacket), salad and creme fraiche
Tomato and mushroom omelettes
Homemade pizza - make the dough beforehand, children can join in chopping/grating cheese and veg for the topping, shove in oven for 20 mins