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Preheat oven to 325°F. Stir Sauce Mix and milk in medium saucepan. Stirring constantly, cook on medium heat 5 minutes or until thickened. Stir in sour cream and chiles; set aside.
Heat 1 tablespoon of the oil in large skillet on medium heat. Add chicken; cook and stir 3 minutes or until lightly browned. Remove from skillet. Add remaining 1 tablespoon oil to skillet. Add onion and bell pepper; cook and stir 10 minutes or until tender. Return chicken to skillet. Stir in 1/2 cup of the sauce.
Spread 1/2 cup of sauce in lightly greased 13x9-inch baking dish. Heat tortillas as directed on package. Divide the chicken mixture evenly among each tortilla. Fold over tortillas sides; place seam-side down in baking dish. Pour remaining sauce over enchiladas. Sprinkle with cheese.
Bake 40 minutes or until heated through and cheese is melted.