Spot the chicken bosoms in a single layer in a 13 * 9 heating dish. Sprinkle with spinach, mushrooms, and preparing (pre-fry new mushrooms).
Join green onion cream cheddar, chicken stock, and olive oil. Pour the sauce over the mushrooms. Cover with a sheet of foil without fixing and heat in a broiler preheated to 375F for 20 minutes. At that point eliminate the thwart and prepare for an additional 20 minutes.
Sprinkle the ground mozzarella over the dish and cook for another 5-10 minutes, or until the cheddar melts and starts to bubble.