01 - Preheat oven to 375°F. Lightly grease a 9x13-inch casserole dish with nonstick spray or butter.
02 - In a large mixing bowl, stir together the shredded chicken, black beans, corn, chopped onion, garlic, half of the shredded cheese, ground cumin, chili powder, salt, and pepper until evenly combined.
03 - In a separate bowl, whisk the salsa verde and sour cream together until smooth and well blended.
04 - Spread a thin layer of the salsa verde sauce across the bottom of the prepared casserole dish. Arrange half of the corn tortilla strips evenly over the sauce.
05 - Spread half of the chicken filling over the tortilla strips, then drizzle generously with additional salsa verde sauce.
06 - Repeat the layering: arrange the remaining tortilla strips, spread the remaining chicken filling on top, and pour the rest of the salsa verde sauce evenly over the surface.
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.
09 - Remove the foil and continue baking for another 10 minutes, or until the cheese is bubbly and lightly golden on top.
10 - Let the casserole stand for 5 minutes before slicing. Garnish with fresh cilantro, avocado slices, and lime wedges if desired. Serve warm.