I love crustless quiches because they're easy to prepare and they make a delicious high protein meal. The ingredients in this flavorful spinach quiche include cheddar cheese, bacon, and seasonings. Serve this quiche with a cup of soup, baked beans, or a simple tossed salad for a fabulous lunch, brunch, or evening meal. Feel free to saute 1/2 to 1 cup of sliced fresh mushrooms with the onions.