In a large skillet cook and drain the ground beef.
Add the 2 packets of taco seasoning and water, let cook for a few minutes. Add corn, black beans, and tomatoes, mix and let it heat through.
In a 9 x 13 baking dish, put just enough of the mixture on the bottom of the baking dish to cover. Put 2 tortillas down to cover the bottom. put a layer of the beef mixture down and a thin layer of cheese. continue layers until the top is the beef mixture then cheese.