Egg & Sausage Casserole

Overnight egg and sausage casserole is the make-ahead breakfast dish that has rescued every Christmas morning, Easter brunch, and house-full-of-guests Saturday since the 1970s. Crustless bread gets layered with browned sausage, grated cheese, and a custard of eggs, milk, and dry mustard, then refrigerated overnight so the bread fully absorbs the egg mixture into something halfway between a strata and a savory bread pudding.

The morning-of step adds a can of cream of mushroom soup whisked with extra milk poured over the casserole before baking. That liquid soaks into the still-firm strata as it bakes, keeping the casserole moist and adding a gravy-like richness.

A long, low bake at 300°F (150°C) for 90 minutes lets everything set without overcooking the eggs. Cuts cleanly into 8 squares for serving.

Pro Tips

• Trim crusts from the bread (the recipe specifies it). Crusts stay tough and dry in the casserole and disrupt the smooth custardy texture.
• Brown the sausage thoroughly and drain well on paper towels. Greasy sausage makes a greasy casserole; well-drained sausage adds flavor without weighing it down.
• Use sharp cheddar or a sharp cheese blend. Mild cheese disappears in the long bake; sharp cheese holds its flavor.
• The 24-hour refrigeration is mandatory. Eaten same-day, the bread is still distinct; given a full day, it dissolves into a unified custard texture.
• Let the casserole rest 10 minutes after baking before slicing. The center finishes setting and slices cleanly instead of running.

Variations

• Use breakfast sausage, Italian sausage, or chorizo for different flavor profiles.
• Replace cream of mushroom with cream of chicken or cream of celery soup for a different background flavor.
• Add 1 cup of sauteed mushrooms, bell peppers, or chopped spinach to the layers for vegetable boost.