Blend onion, chili powder, salt, pepper, soup, sour cream and chilis. Mix 1 cup of sauce with chicken. Spoon enough meat mixture and cheese on each tortilla to cover 1/3 of tortilla, reserving 1 cup of cheese for the top. Roll up each tortilla beginning with the filled edge. Place seam side down in greased 13x9 inch baking dish. When tortillas are completed, cover with the remaining sauce and freeze with the extra cheese in a bag taped to the baking dish.
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When thawed, sprinkle remaining cheese on top and bake, uncovered, at 375 degrees for 20 to 25 minutes.