Preheat oven to 400°.
Combine the first 7 ingredients (milk through green chiles), using just 1/2 tablespoon of the taco seasoning, in a large bowl, stirring just until moist. Pour mixture into a round pie plate (mine was glass) coated with cooking spray.
Bake at 400° for 20-30 minutes. While corn is baking, toss the chicken in the remaining 1 tablespoon taco seasoning. When corn is done – it will be just barely set and golden brown – pierce entire surface liberally with a fork (it might stick a little bit to the fork). Pour enchilada sauce over top. Top with chicken; sprinkle with cheese. Bake at 400° for 15 minutes or until cheese melts. Remove from oven; let stand 5 minutes. Cut into 8 pieces; top each serving with cilantro and Cotija cheese.