1. Spray the inside of your Crock Pot with cooking spray.
2. Slice the onion and spread it evenly in the bottom of the pot.
3. Place the chicken breasts on top of the onions.
4. Add the cream of chicken soup, onion soup mix, and beef broth to a bowl.
5. Whisk until the mixture is smooth.
6. Pour it over the chicken and onions.
7. Cover and cook on LOW for 5 hours.
8. After 5 hours, lay slices of provolone cheese on top of the chicken.
9. Cover again and let the cheese melt for about 10 minutes.
10. Uncover and sprinkle dried thyme and crispy fried onions over the top.
11. Leave it uncovered and cook on LOW for another 10 minutes.
12. Serve hot with egg noodles, mashed potatoes, or rice.