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.

Freeze option: Cover and freeze unbaked casserole. To use, partially thaw in refrigerator overnight. Remove from refrigerator 30 minutes before baking. Preheat oven to 375°. Bake casserole as directed, increasing time as necessary to heat through and for a thermometer inserted in center to read 165° If desired, sprinkle with parsley.