This is a Mexican casserole that my Grandpa used to make every Thanksgiving and Christmas. The smell alone makes me feel like I am six years old and waiting for dinner to start. This recipe has been handed down from my Grandpa to my dad to me. The original recipe did not call for teaspoons or tablespoons, but with ounces and pounds. It can be made with or without chorizo. I prefer it with soy-based meatless chorizo substitute, which also makes it a good dish for vegetarians.