Add the sliced onions to the bottom of the crockpot. Place the chicken breasts on top of the onions and season both sides with Lawrys seasoning and black pepper.
In a bowl combine cream of chicken soup, beef broth, onion soup mix, and mix together until combined. Then pour the mixture over the chicken.
Put the top on and cook on high for 3 & 1/2 hours.
After 3 & 1/2 hours remove the lid, shake in the worcestershire sauce, and add in the cornstarch paste (made by combining equal parts of the softened butter and cornstarch until it becomes a paste). Then stir it into the crockpot. Put the top back on and cook for another 30 minutes on high.
After 30 minutes remove the lid, turn off the crockpot, and add in provolone cheese slices. Then, put the lid back on for 5 minutes to let the cheese melt.
After 5 minutes remove the lid, and add in thyme & crispy fried onions. Put the lid back on for 5 more minutes.
Once it's done serve over mashed potatoes & garnish with chopped green onions.