Stir together first 5 ingredients. Spoon chicken mixture evenly over each tortilla, and roll up. Arrange in a lightly greased 13- x 9-inch baking dish. Coat tortillas with vegetable cooking spray.
Bake at 350° for 35 to 40 minutes or until golden brown.
Stir together sour cream and taco sauce. Spoon over hot enchiladas, and sprinkle with toppings.