Name: Christmas Morning Casserole Recipes
Prep time: 5 min
Total time: 5 min
Yield: 2 servings
Ingredients: 6 large eggs; 2 cups whole milk; 1 teaspoon salt; ½ teaspoon black pepper; 1 teaspoon Dijon mustard; 6 cups cubed day-old sourdough or French bread; 1 pound breakfast sausage, cooked and crumbled; 1 cup shredded cheddar cheese; ½ cup sliced green onions; ½ cup diced red bell pepper; Butter or cooking spray for the baking dish

This Christmas Morning Casserole combines savory breakfast sausage, eggs, bread, cheddar and colorful vegetables in one make-ahead dish. Assemble it the night before, then bake it on Christmas morning for a warm breakfast without early prep.

Why You’ll Love This Recipe

The overnight rest lets the bread absorb the seasoned egg custard, producing a tender center and golden top. A single 9×13-inch casserole serves a family or holiday brunch table, and most of the work is finished before guests arrive.

Ingredients

Six eggs milk bread sausage cheddar green onions red pepper and seasonings — Gather the ingredients for one 9×13-inch Christmas breakfast casserole.

6 large eggs
2 cups whole milk
1 teaspoon salt
½ teaspoon black pepper
1 teaspoon Dijon mustard
6 cups cubed day-old sourdough or French bread
1 pound breakfast sausage, cooked and crumbled
1 cup shredded cheddar cheese
½ cup sliced green onions
½ cup diced red bell pepper
Butter or cooking spray for the baking dish

Step-by-Step Instructions

Step 1: Whisk the Egg Custard

In a large bowl, whisk the eggs, milk, salt, black pepper and Dijon mustard until the mixture is smooth and evenly blended.

Egg milk Dijon salt and pepper custard whisked in a white bowl — Whisk the egg custard until smooth and evenly seasoned.

Step 2: Layer the Casserole

Grease a 9×13-inch ceramic baking dish. Spread the bread cubes evenly in the dish, then distribute the cooked sausage, cheddar, green onions and diced red pepper across the bread.

Bread sausage cheddar green onion and red pepper layered in a casserole dish — Distribute the bread, sausage, cheese and vegetables evenly in the dish.

Step 3: Add the Custard

Pour the egg mixture slowly over the entire casserole. Press the bread down gently with a spatula so the top pieces begin absorbing the custard without compacting the layers.

Egg custard poured evenly over the layered breakfast casserole — Pour the custard across the entire casserole so the bread begins to soak.

Step 4: Refrigerate Overnight

Cover the baking dish tightly with aluminum foil and refrigerate it overnight. This resting time hydrates the bread and allows the flavors to mingle.

Foil-covered white ceramic casserole dish resting level in a refrigerator overnight — Cover the assembled casserole and refrigerate it overnight.

Step 5: Bake Until Golden

Preheat the oven to 350°F (175°C). Let the covered casserole stand at room temperature for 15 minutes, then bake it covered for 30 minutes. Remove the foil and bake for about 20 minutes more, until the top is golden and the center is set.

Golden baked sausage egg bread and cheddar breakfast casserole — Bake until the center is set and the bread and cheese are golden.

Step 6: Rest and Serve

Let the casserole rest for 5 minutes before cutting it into squares. Garnish with extra green onions if desired and serve warm with fresh fruit and orange juice.

Square serving of Christmas breakfast casserole with berries and orange juice — Serve warm after a brief rest, with fruit and orange juice if desired.

Tips for the Best Christmas Breakfast Casserole

Use day-old bread so it absorbs the custard without becoming mushy.
Drain the cooked sausage well before layering it into the dish.
Cut the bread and bell pepper into even pieces for balanced portions.
Keep the dish covered during the first part of baking so the center cooks before the top browns.
Check doneness in the center: the custard should be set and no longer look wet.

Storage and Reheating

Refrigerate leftovers in an airtight container for up to three days. Reheat individual portions in the microwave, or cover a larger portion and warm it in a 325°F oven until heated through.