Preheat oven to 350
Mix 1-3/4 cup sour cream, canned chilies, green onion, cilantro & cumin in a large bowl. Mix in chicken, mushrooms, 1 cup cheese, tomatoes, 3 tbls Ancho Chilie sauce (see recipe), salt & pepper to taste.
Brush Ancho Chilie sauce on tortillas, coating both sides. Pour a small amount of sauce on bottom of 9x13 baking dish. Spoon 1/2 cup of filling in center of tortilla. Roll closed; arrange seam side down. Spoon sauce over tortillas.
Cover with foil and bake 30-45 minutes. Uncover and sprinkle remaining cup of cheese over tortillas. Bake uncovered until cheese melts, approx.5 min.
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