A mexican casserole is sometimes called a tortilla pie, or a tortilla casserole is simply a few mexican ingredients layered in between tortillas (similar to the way a lasagna is layered) then baked in the oven. Sound good? Read onThis lacto-vegetarian mexican casserole recipe is a one dish vegetarian casserole perfect for those busy nights. You can get this meatless vegetarian enchilada baked mexican casserole in the oven in just a few minutes. Don't be fooled by the somewhat long ingredients list. All you need to do is lay a few corn tortillas in a casserole or baking dish, cover it with beans (and some sauted veggies) and cheese, and repeat, just like making a lasagna. The garnishes are all optional. A simple mexican-inspired meal the whole family will enjoy, and, because this recipe makes quite a bit, you can plan on having leftovers.