Preheat oven to 375 degrees.
Cook Rice in water according to directions. Saute Onions, Carrots, Celery, Mushrooms and Garlic. Add Flour, Tarragon and Thyme and stir. Add Chicken Broth and Sherry and simmer till thickened.
Spray baking dish with butter spray. Spread Rice evenly over bottom of pan, followed by a layer of chicken. Add layer of chopped Artichoke hearts.
Pour saute mixture over top and sprinkle with cheese and crushed croutons.
Bake at 375 degrees for approximately 30 minutes.
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