Preheat oven to 350 degrees. Prepare four 9x13 casserole dishes with nonstick cooking spray.
In a large skillet over medium high heat, brown the ground beef with the onion until the meat is crumbled and no longer pink. Drain well and return to pan.
Add taco seasoning, all chopped green chilies, and 2 cup enchilada sauce to meat. Heat until bubbly, about 10 minutes.
In the bottom of the casserole dishes, layer tortillas, meat sauce, corn, black beans, and cheese. Repeat at least once.
Top the casseroles with remaining enchilada sauce and cheese.
Wrap extra casseroles and freeze for upcoming freezer meals.
Bake desired amount of casseroles for 30 minutes or until the cheese has melted and the edges bubble.