Preheat oven to 400 degrees. Place butter in a 13x9 baking dish and place in oven until melted and remove.

Generously salt & pepper raw diced chicken.

Sauté onion & mushrooms in a little butter with a little salt & pepper.

Pour stock into baking dish with the melted butter. Add onions & mushrooms, rice, chicken & parsley and stir. Generously sprinkle with about 3 oz. parmesan cheese and do not stir.

Cover tightly and bake for about 30-40 minutes. Remove from oven and let sit a few minutes covered before serving.