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