I want to do a simple chicken thing for a few people.

I thought i would buy chicken legs or thighs, put them in a roasting tray,
and then put some chopped vegetables in a casserole dish (with lid either on
or off, i dont know which is best); in the same oven if possible.

Could anyone please advise a novice which *oven setting* might allow me to
roast the chicken pieces and the vegetables at the same time. Thanks