Sauté onion in margarine until tender. Add mushrooms, chiles, soup,
broth and turkey. Add sour cream. In large buttered casserole, layer 1/2 of
the tortillas, soup mixture and cheese. Repeat, ending with the cheese on top.
Bake at 350° for 30 minutes. Let stand for about 10 minutes before serving.
Can be baked in 9x13 pan..
