Quiche is such a versatile dish because you can literally fill it with almost anything. While I love the classics, sometimes I like to add things that make me feel a little less guilty about indulging. I also have cut the fat down (except for the crust) in this recipe, but you can certainly use heavy cream if you wish. The intent is to use fresh vegetables, but you can also use frozen spinach. Just make sure you really squeeze out the water.