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 until all ingredients are evenly distributed.
03 - Spread 1/2 cup of enchilada sauce evenly across the bottom of the prepared baking dish.
04 - Arrange four tortillas over the sauce layer, tearing as necessary to fit and cover the bottom completely.
05 - Spread half of the chicken mixture evenly over the tortillas. Sprinkle with 2/3 cup of shredded cheese.
06 - Place the remaining four tortillas over the filling, tearing as needed to create a complete layer.
07 - Spread the remaining chicken mixture over the tortillas. Top with another 2/3 cup of shredded cheese.
08 - Place the final tortilla layer over the top, tearing as necessary for complete coverage.
09 - Pour the remaining 1/2 cup enchilada sauce evenly over the tortilla surface. Top with the remaining shredded cheese and black olives if desired.
10 - Cover the baking dish tightly with aluminum foil. Bake for 20 minutes to allow flavors to meld.
11 - Remove the foil and continue baking for 10 additional minutes, or until the cheese is bubbly and golden brown.
12 - Let the enchilada bake rest for 5 minutes before cutting. Garnish with fresh cilantro, green onions, avocado slices, sour cream, and lime wedges.