Sausage and Spinach Breakfast Strata

I’m using the same ingredients here as for the quiche to illustrate how interconnected dishes are. I don’t look at recipes as isolated preparations, but rather preparations along a single continuum. Of course, you can swap out the breakfast sausage for Italian sausage, or bacon, or ham, or chorizo or any meat you choose. (Or you can replace the sausage with sautéed mushrooms to make this vegetarian—if you’re doing this, try to find a variety of wild mushrooms.) You can throw in different in