01 - Preheat oven to 375°F. Lightly grease a 9x13-inch baking dish.
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 well combined.
03 - Spread 1/2 cup enchilada sauce evenly over the bottom of the baking dish.
04 - Arrange 4 corn tortillas on top of the sauce, allowing them to slightly overlap.
05 - Spread half of the chicken mixture evenly over the tortillas.
06 - Drizzle 1/2 cup enchilada sauce over the chicken mixture, then sprinkle with 1/2 cup of cheese.
07 - Repeat the layering process: 4 tortillas, remaining chicken mixture, 1/2 cup enchilada sauce, and 1/2 cup cheese.
08 - Place the remaining 4 tortillas on top. Cover with the remaining enchilada sauce and sprinkle with the final 1/2 cup of cheese.
09 - Cover with foil and bake for 25 minutes. Remove foil and bake for an additional 10 minutes, or until cheese is bubbly and the casserole is heated through.
10 - Let the casserole rest for 10 minutes before slicing. Garnish with cilantro, jalapeños, and extra sour cream if desired.