Add water and wild rice to sauce pan and cook until 1/2 way cooked. Until 1/2 of the water is absorbed. About 30 minutes
Melt butter in large frying pan, add onion, celery and mushrooms. Cook until onion and celery are tender.
In large bowl, mix the cream of mushroom soup, the chicken broth.
Stir in cooked celery, mushrooms, and onions.
Stir rice with its remaining water.
Stir in croutons.
Put in buttered casserole and bake at 350 for 1 hour.
I have doubled this recipe, baked for 1/2 hour and then put in crockpot on low and brought as a great dish for pot luck.