01 - Preheat oven to 375°F. Lightly grease a 9x13-inch casserole dish with cooking spray or butter.
02 - In a large mixing bowl, combine the shredded chicken, black beans, corn, red onion, garlic, half of the Monterey Jack cheese, ground cumin, chili powder, salt, and black pepper. Toss until evenly distributed.
03 - In a separate bowl, whisk together the salsa verde and sour cream until smooth and fully blended.
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 over the sauce, then spread half of the chicken mixture on top. Drizzle with additional salsa verde sauce.
05 - Repeat the layering with the remaining tortilla strips, the rest of the chicken mixture, and the remaining salsa verde sauce, spreading each layer evenly.
06 - Sprinkle the remaining Monterey Jack cheese over the top layer. Cover the dish tightly with aluminum foil and bake for 25 minutes.
07 - Remove the foil and continue baking for 10 minutes, or until the cheese is bubbly and lightly golden on top.
08 - Let the casserole stand for 5 minutes before slicing. Garnish with fresh cilantro, avocado slices, and lime wedges if desired. Serve warm.