Both of mine went 7.30-5.30, don't sweat it. Lots of children do.
A little supper snack is a great time to get some extra fruit and veg in - crudités and dip, fruit and cheese, veg soup.
Stuff on toast is fine - beans, cheese, mashed banana, avocado. Do it between wraps and you can call it a quesadilla 
I also batch cooked a lot of stuff in small portions and served with microwaved frozen veg - chicken drumsticks, fish pie and shepherds pie in ramekins, pizza scrolls, muffin tin pies, muffin tin omelettes. Plus any leftovers you have from other meals.
Make and freeze a stack of sauces and throw over quick cook pasta - cheese, pesto, bolognese, broccoli, tomato. Add extra veg to all.
Ham, scrambled egg and instant noodles with frozen veg = "stir fry"
Small portions of salmon can be frozen the. poached in milk in the microwave in minutes. Freeze potato/sweet potato mash and peas alongside