My go to meal when I was a busy working mum and my children were still at home:
You need 2 very large trays, 2 large packs of chicken breasts, and a mixture of tomatoes, peppers, onions, plus garlic cloves in their skins..
Marinade the halved chicken breasts in olive oil, a splash of balsamic, a spoonful of mustard of your choice, salt, pepper + a few chili flakes if you like. Instead of mustard you could also use terriaki sauce, Hoisin sauce, or some other Asian flavouring.
Cut and mix tomatoes and peppers and coat in a similar mix, minus the mustard/terriaki etc.
Spread on 2 large trays. Bake veggie tray for 20 minutes at 200C, then add the onions and garlic; give a good stir. Bake for 20 minutes more and bake the chicken breasts at the same time. Baste halfway if you have time/remember/can be bothered. Serve with quinoa, rice, pasta, potatoes, whatever.
Delicious. Leftover chicken breasts serve as a basis for another meal and/or sandwiches.