What's in a name? In the case of this egg, spinach and two cheese crustless quiche, you could call it an egg casserole, breakfast casserole, even a frittata. In our house, we use the generic term "eggy cheesy thing". Crustless quiche -- the dish we make when we're watching what we eat, and don't want the added calories and carbs in a crust -- accommodates mix-ins of leftover cooked pasta, vegetables, beans, or even shredded rotisserie chicken, in any combination. At least once a week, we eat eggy cheesy things for dinner, because I always keep eggs and cheese in the pantry and the dish comes together with a minimum of work. When I have dark leafy greens like spinach in my refrigerator, I like to make this quiche and portion it for a week's worth of breakfasts, so I know I'm eating my vegetables right at the beginning of the day.