01 - Preheat oven to 375°F. Lightly grease a 9x13 inch baking dish.
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 well combined.
03 - Spread 1/2 cup enchilada sauce on bottom of baking dish. Layer four tortillas over sauce, tearing as needed to fit.
04 - Spread half the chicken mixture over tortillas. Sprinkle with 2/3 cup shredded cheese.
05 - Add another layer of tortillas. Top with remaining chicken mixture and 2/3 cup cheese.
06 - Place final tortilla layer on top. Pour remaining 1/2 cup enchilada sauce evenly over surface. Top with remaining cheese and olives if using.
07 - Cover with foil and bake for 20 minutes. Remove foil and bake uncovered for 10 minutes until cheese is bubbly and golden.
08 - Let rest for 5 minutes. Garnish with cilantro, green onions, and avocado. Serve with sour cream and lime wedges.