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1
Adjust oven rack to middle position and heat oven to 300 degrees.
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2
Combine 3/4 cup enchilada sauce, chicken, 1 cup cheese, cilantro, and olives.
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3
Place 5 tortillas on baking sheet and lightly coat both sides with cooking spray. Bake tortillas until just pliable, about 2 minutes. Working quickly, transfer one tortilla at a time to work surface, fill with 1/3 cup chicken mixture, and roll tightly. Transfer, seam side down, to large plate. Repeat warming and rolling process with remaining 5 tortillas. Place plate in freezer until enchiladas are frozen, at least 1 hour.
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4
Place remaining sauce in freezer-safe container and press 2 layers of plastic wrap directly onto surface of sauce. Tightly wrap enchiladas in bundles of 5, first in plastic and then in foil. Freeze for up to 2 months.
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5
When ready to serve: Adjust oven rack to middle position and heat oven to 350 degrees. Defrost enchilada sauce in microwave on defrost setting, about 12 minutes.
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6
Coat 13 by 9-inch baking dish with cooking spray. Arrange frozen enchiladas in single layer in baking dish and coat tops with cooking spray. Bake until tops of tortillas are just beginning to flake, about 20 minutes. Remove dish from oven, top enchiladas with 1 1/2 cups sauce, and bake 10 minutes longer. Sprinkle enchiladas with remaining 1 1/2 cups cheese and bake until cheese melts and center of casserole is hot and bubbling, 3 to 5 minutes. Serve, passing remaining sauce and garnishes (see note above) at table.
