Preheat oven to 375°. In a small skillet, warm enchilada sauce over medium heat. Dip four tortillas, one at a time, in sauce to coat both sides; arrange on bottom of a greased 9-in. pie plate, overlapping to fit.
Layer with 1 cup chicken, 1 cup cheese and 2 tablespoons olives. Repeat tortilla and chicken layers. Pour remaining enchilada sauce over top. Sprinkle with the remaining cheese and olives.
Bake 10-15 minutes or until heated through and cheese is melted. If desired, serve with salsa.