Cook chicken; cut into small pieces. in a large saucepan, simmer taco seasoning, chicken broth and flour until it starts to thicken. Remove from heat; add chicken, sour cream, green chilies and tomatoes. in a lightly greased (or spray with Pam) baking dish, layer Fritos, half of chicken mixture, half cheese and half onions; repeat layers with remaining ingredients. bake at 375 degrees for 20 minutes; let stand about 5 minutes before serving.
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