In A Large Skillet, Brown Chicken In Oil On Both Sides. Transfer To A Slow Cooker. In A Bowl, Combine The Tomato Sauce, Mushrooms, Onion, Wine Or Broth, Garlic, Oregano, Thyme, Salt And Pepper; Pour Over Chicken. Cover And Cook On Low For 4-5 Hours Or Until Chicken Juices Run Clear. Serve Over Spaghetti.