Sausage, Cheese, & Egg Casserole

This is the brunch casserole every holiday hostess has tucked into the back of her recipe box, the one that makes Christmas morning and Easter Sunday possible. Layered croutons, sharp cheddar, browned sausage and a milk-egg custard get assembled the night before, then bake into a puffy, golden casserole while the host pours coffee and accepts compliments.

The overnight rest is the technique that makes this work. The croutons absorb the milk and egg mixture during the long fridge time, transforming from dry crunchy cubes into tender custard-soaked bread. Without the overnight rest the croutons stay crunchy and the casserole bakes uneven, with dry pockets and soupy ones.

The cream of mushroom soup mixed with milk and poured on top before baking is the old-school move that adds richness without making the casserole feel heavy. The soup essentially becomes a thin bechamel that bakes into the top crust, browning into a slightly crispy, deeply savory finish.

Using 1.5 pounds of bulk pork sausage is the right amount. Less and the casserole tastes mostly of bread and egg; more and it becomes a sausage-heavy meat dish. The 1.5-pound mark hits the sweet spot of substantial without overwhelming.

Pro Tips

• Use herb-seasoned croutons. They contribute pre-made flavor; plain croutons need extra seasoning.
• Drain the cooked sausage thoroughly. Pooling fat makes the casserole greasy.
• The low 300°F (150°C) bake is intentional. Higher heat cooks the eggs too fast and produces a rubbery casserole.
• Let stand 10 minutes after baking before serving. The casserole sets up properly during this rest.

Variations

• Substitute cooked bacon, ham, or chorizo for the sausage for different flavor profiles.
• Use a mix of cheddar and pepper jack for a spicy version.
• Add 1 cup of sauteed mushrooms, bell peppers, or chopped spinach for more vegetables.
• Swap cream of mushroom soup for cream of chicken or cream of celery if preferred.