I just posted a recipe for a sausage and mushroom breakfast casserole that's basically the same idea, but to my ears, breakfast casserole sure sounds a lot more appetizing. "Crustless" sounds like you got cheated out of something, like you are settling, instead of what the recipe really is -- a deliciously cheesy, sausage, mushroom, and egg casserole, made lighter by the omission of a buttery, high-carb crust.
Regardless of what you call this, it's a great morning meal, and perfect for larger groups. Cooking breakfast or brunch for a crowd can be quite a challenge, especially if you're trying to make the eggs to order. This breakfast casserole solves that problem, and deliciously so. Enjoy!
Photo (c) John Mitzewich