1Combine the cornbread mix, milk, and egg to prepare the base.
2Brown the ground beef in a pan, then stir in the taco seasoning and water.
3Mix in the drained Mexicorn and Rotel with the seasoned beef.
4Layer the ingredients in a baking dish, spreading the sour cream and part of the cheese over the beef mixture, then topping with the cornbread batter.
5Bake until set, then top with remaining cheese and green onions.