I tore this recipe out of our state newspaper years and years ago, and it finally worked its way into my attention span. I don't know what is Spanish about it (except the onion), but I do know it is a really good casserole that is easy to make. It can be made ahead and frozen. It can be halved, doubled or tripled without hurting it, and it is really tasty. The heat can be adjusted according to your taste. Oh, yes, a real kid's favorite, too.