Preheat oven to 375 degrees. Saute onion in margarine in saucepan until golden brown. The best flavor comes when the onion has been caramelized, but not burnt. Remove onions from pan. Add green enchilada sauce and green chiles to pan and heat until bubbly, stirring often. Meanwhile, toss chopped chicken with salsa. Stuff tortillas with chicken mixture and place face down in a 13 x 9 pan. Sprinkle onions over them, then pour over enchilada/chile sauce. Sprinkle cheese on top. Bake, uncovered, 30 minutes.
Serve topped with sour cream.
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