In a large mixing bowl, combine the cooked shredded chicken, black beans, corn, enchilada sauce, ground cumin, chili powder, garlic powder, onion powder, salt, and pepper. Mix well to combine.
Lightly grease the slow cooker with cooking spray or a little oil to prevent sticking.
Layer half of the tortilla strips at the bottom of the slow cooker.
Pour half of the chicken mixture over the tortilla strips, followed by half of the shredded cheese.
Repeat the layering process with the remaining tortilla strips, chicken mixture, and top with the remaining cheese.
Cover the slow cooker and cook on low for 4 hours, or until the cheese is melted and bubbly, and the casserole is heated through.
Once done, turn off the slow cooker and let the casserole sit for a few minutes before serving.
Serve hot, garnished with optional toppings like sour cream, chopped cilantro, or avocado if desired.