01 - Preheat oven to 375°F. Lightly grease a 9x13-inch casserole dish with cooking spray or butter.
02 - In a large mixing bowl, stir together the shredded chicken, black beans, corn, chopped red onion, minced garlic, half of the shredded Monterey Jack cheese, ground cumin, chili powder, salt, and black pepper until evenly distributed.
03 - In a separate bowl, whisk the salsa verde and sour cream together until smooth and well combined.
04 - Spread a thin, even layer of the salsa verde sauce across the bottom of the prepared casserole dish. Arrange half of the corn tortilla strips in an even layer over the sauce.
05 - Spread half of the chicken mixture evenly over the tortilla strips. Drizzle generously with more salsa verde sauce.
06 - Repeat the layering process with the remaining tortilla strips, chicken mixture, and salsa verde sauce, spreading each layer evenly.
07 - Sprinkle the remaining shredded Monterey Jack cheese evenly across the top of the casserole.
08 - Cover the dish tightly with aluminum foil and bake for 25 minutes until heated through.
09 - Remove the foil and continue baking for 10 minutes, or until the cheese is bubbly and lightly golden on top.
10 - Let the casserole stand for 5 minutes before serving. Garnish with chopped fresh cilantro, sliced avocado, and lime wedges if desired. Serve warm.