1. In 13"x9" baking dish, spread 1 cup sour cream on bottom and sides.
2. In medium sauce pan, flake chicken and add in 2 cups sour cream, mushrooms, chilies, onion, and spices. Cook over low heat, stirring occasionally, just until heated through.
3. Spread 1/2 cup chicken mixture along the center of a tortilla. Fold sides over and place on baking dish seam side down. Repeat till all mixture is gone. Spread remaining sour cream over tortillas. Top with cheese.
4. Bake until cheese is melted at 450 degrees F, about 20 min.