Preheat oven to 375°.
In a greased 13x9-in. baking dish, layer half of each of the following: chicken, enchilada sauce, sour cream, tortillas and cheese. Repeat layers.
Bake, covered, 40 minutes.
Uncover; bake until bubbly, about 10 minutes longer.
Let stand 15 minutes before serving. If desired, sprinkle with parsley.