01 - Preheat oven to 375°F. Lightly grease a 9x13-inch baking dish with cooking spray or oil.
02 - In a large bowl, combine shredded chicken, 1 cup enchilada sauce, 1 cup shredded cheese, sour cream, corn, onion, green chiles, cumin, garlic powder, smoked paprika, salt, and pepper. Mix until thoroughly incorporated.
03 - Spread 1/2 cup enchilada sauce evenly across the bottom of the prepared baking dish.
04 - Arrange 4 corn tortillas in the dish, slightly overlapping to cover the sauce base.
05 - Spread half of the chicken mixture evenly over the tortillas.
06 - Drizzle 1/2 cup enchilada sauce over the chicken layer, then sprinkle with 1/2 cup shredded cheese.
07 - Repeat layering with 4 more tortillas, remaining chicken mixture, 1/2 cup enchilada sauce, and 1/2 cup cheese.
08 - Complete with the final 4 tortillas, remaining enchilada sauce, and the last 1/2 cup of shredded cheese on top.
09 - Cover the dish tightly with aluminum foil and bake for 25 minutes.
10 - Remove foil and bake an additional 10 minutes, until cheese is bubbly and lightly browned.
11 - Let the casserole rest for 10 minutes before slicing to allow layers to set. Garnish with cilantro, jalapeños, and extra sour cream if desired.