Preheat the oven to 400 degrees. Spray a pie pan with cooking spray and put it aside.
Combine the milk, egg, 1 tablespoon of fajita seasoning, cream corn, corn muffin mix, and green chilies in a large bowl. Stir just until moist. Pour the mixture into the pie pan. Bake for 25 minutes or until the cornbread is golden brown.
Meanwhile, toss the chicken with the remaining fajita seasoning.
Remove the cornbread from the oven and pierce the entire surface with a fork. Pour enchilada sauce over top. Top with the chicken; sprinkle with cheddar cheese. Bake for 15 minutes.
Remove from the oven and let stand for 5 minutes. Top with cilantro and Queso Fresco.