First, preheat your oven to 350°F (175°C). While it’s heating, grab a large mixing bowl. Toss in your shredded cooked chicken, enchilada sauce, and sour cream. Stir everything until the mixture is creamy and well combined. This is the heart of your enchiladas.
Grab your 9x13 inch baking dish. Cover the bottom with half of the tortilla chips—don’t crush them, just arrange them flatly. Then, spoon half of the creamy chicken mixture over the chips. Spread it out evenly. Now sprinkle one cup of the shredded Mexican cheese over that layer.
Repeat the layering process with the rest of the chips, the remaining chicken mix, and the other cup of cheese. Top everything off with sliced black olives and chopped green onions if you like those.
Slide your dish into the preheated oven. Bake for about 20 to 25 minutes, or until the cheese is bubbly and golden. Once done, pull it out and let it sit for a couple of minutes. Garnish with chopped cilantro for a fresh, final touch.