On stove-top, cook ground beef, onion, and garlic until brown. Drain off any excess fat.
Add taco seasoning, green chilies, corn and black beans to ground meat. Cook until heated through.
In a large bowl, combine meat mixture, ¾ of cheese blend, and all of the tator tots. Stir well to combine.
Pour ⅓ of the enchilada sauce in bottom of prepared baking pan and put meat mixture in, lightly patting in an even layer. Pour remaining enchilada sauce over mixture.