01 - Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish with cooking spray or a small amount of oil.
02 - In a large bowl, combine shredded chicken, 1 cup enchilada sauce, black beans, corn, red onion, cumin, chili powder, garlic powder, salt, and pepper. Mix thoroughly until all ingredients are evenly distributed.
03 - Spread 1/2 cup of enchilada sauce evenly across the bottom of the prepared baking dish to prevent sticking.
04 - Arrange four tortillas over the sauce, tearing pieces as necessary to fit and cover the entire bottom surface.
05 - Spread half of the chicken mixture evenly over the tortillas. Sprinkle with 2/3 cup of shredded Mexican cheese blend.
06 - Add another layer of tortillas, then spread the remaining chicken mixture on top. Add another 2/3 cup of cheese over the filling.
07 - Place the final tortilla layer over the top. Pour the remaining 1/2 cup enchilada sauce evenly over the surface. Top with the remaining cheese and black olives if using.
08 - Cover the baking dish tightly with aluminum foil. Bake for 20 minutes to allow the flavors to meld and the filling to heat through.
09 - Remove the foil and continue baking for an additional 10 minutes, or until the cheese is bubbly and beginning to turn golden brown.
10 - Let the enchilada bake rest for 5 minutes before serving. Top with fresh cilantro, green onions, avocado slices, sour cream, and lime wedges.