This need not really be a casserole. Once you’ve heated everything through on the stove top, you can mix and match and serve it as you choose. For example, baking makes the tortilla chips a bit soggy, so if you added them after baking, you’d get more of a crunch.
Similarly, turn this into a taco salad by lining a bowl with crushed up tortilla chips (or Frito chips), then top with the mixture, cheese, lettuce, tomato and onion - or use the mixture inside tacos or enchiladas topped with sauce of your liking.
For a super easy, super speedy recipe, swap out all of the stovetop ingredients for a can of prepared chili (like Hormel) - vegetarian or meat as you choose.