Stir in the spinach and corn. Cook and stir until the spinach is wilted. Spread 1/2 cup enchilada sauce in a 3-quart shallow baking dish. Line the bottom of the baking dish with 6 tortillas ...
To make the filling, heat the oil in a large flameproof casserole dish ... Season with lots of freshly ground black pepper and mix well. Trim the beef of any hard fat and sinew.
There are so many ways to make a healthier casserole. You've got vegan and vegetarian casseroles such as vegetable lasagna, vegan moussaka with lentils and vegetarian enchilada casserole.