We're heading into the fall holiday season, which means that brunch casseroles are about to enjoy their heyday. So we decided to revisit one of our most popular recipes ever — a recipe published several years ago for a breakfast bake with bread, pancetta, Gruyere, and eggs. I'm afraid that I'll sound horribly hyperbolic if I talk about this recipe too long. It's rich, eggy, and unbelievably, incredibly delicious. This is one to memorize, folks, and to pull out for in-laws and overnight guests. It may just be the very best brunch casserole we've ever made.