Trim fat from meat. Cut steak into serving-size portions. Place onion in a 3-1/2- or 4-quart slow cooker; place meat on top of onion. In a small bowl combine soup, oregano, thyme, and pepper; pour over meat.
Cover and cook on low-heat setting for 10 to 12 hours or on high-heat setting for 5 to 6 hours. If desired, serve with hot cooked pasta. Makes 6 servings.