Chicken breasts are an excellent medium for stuffing, or dicing and sauteing with vegetables. They do cry out for butter or olive oil but they are also an excellent medium for herbs and spices.

When I roast a chicken, I invert it breast side down, so as to bring as much flavor and juices to the breasts as possible. I also rub herbs or rubs under the skin of the breasts to increase flavor.
Stuffing them with mushroom, onion, cheese and paprika is also delicious. Almost any flavor works. On their own, the chicken breasts can be quite bland and uninteresting. But with a little imagination they become quite flavorful.

Good Luck!