Slow Cooker Chicken Cacciatore

white button mushrooms (halved)

red bell peppers (seeded and sliced in strips)

large onion (thinly sliced)

split chicken breasts (bone-in, skin on)

salt

oregano

dried rosemary (crushed in palm of hand)

pepper

kalamata olives (pitted)

whole peeled tomatoes

dry red wine (such as Chianti (or chicken broth))

minced parsley or basil and parmesan cheese (optional, to serve)