A light coat of non-stick spray to the bottom of your casserole pan is useful.
You can substitute any type of ground meat like chicken, pork, or turkey instead of beef.
Make a vegetarian version with veggie chorizo, no need to add the taco seasoning since it is already seasoned.
If you use a larger casserole pan, then you can reduce the cooking time by about ten minutes since the ingredients are less deeply layered.