Begin by preheating your oven to 375°F (190°C). This will ensure that your casserole bakes evenly.
In a large mixing bowl, combine the shredded chicken with the sliced red and green bell peppers, sliced onion, black beans, corn, chili powder, cumin, paprika, garlic powder, onion powder, and black pepper. Stir thoroughly until all ingredients are evenly mixed.
Take a 9x13-inch baking dish and spread half of the tortilla wedges evenly over the bottom to create a base layer.
Next, add half of the chicken and vegetable mixture on top of the tortilla layer, spreading it out evenly. Pour half of the salsa over this layer, then sprinkle a third of the shredded cheese on top.
Repeat the layering process: add the remaining tortilla wedges as a second layer, followed by the rest of the chicken mixture, the remaining salsa, and finish with the rest of the cheese on top.
To prevent the cheese from burning, cover the baking dish loosely with aluminum foil and place it in the preheated oven. Bake for 25 minutes.
After the initial 25 minutes, carefully remove the foil and bake for an additional 15 minutes, or until the cheese is bubbly and has developed a golden crust.
Once baked, remove the casserole from the oven and let it cool slightly for about 5-10 minutes before serving. This helps the layers set better. Garnish with freshly chopped cilantro if desired for an added burst of flavor and color.