Name: Christmas Breakfast Casserole: Make It the Night Before
Prep time: 25 min
Cook time: 65 min
Total time: 90 min
Ingredients: 8 cups day-old whole-grain bread (cut into 1-inch cubes, about 10 oz); 1 pound turkey breakfast sausage (casings removed); 1 medium red bell pepper (diced); 1 small yellow onion (diced); 12 large eggs; 2 cups whole milk (whole or 2%); 1 1/2 cups sharp cheddar cheese (shredded, divided); 1 teaspoon dry mustard; 1 teaspoon kosher salt; 1/2 teaspoon black pepper

Christmas morning should smell like coffee and cinnamon, not like frantic last-minute chopping. This Christmas breakfast casserole makes that possible: on Christmas Eve you layer whole-grain bread, turkey sausage, sweet peppers and sharp cheddar in a baking dish, pour over a creamy egg custard, and let it soak overnight. On Christmas morning it bakes while the presents get opened. Twenty-five minutes of prep, eight happy servings.

Why an Overnight Christmas Breakfast Casserole Works

Think of this dish as a savory strata, and strata are the quiet heroes of holiday cooking. The bread soaks up the egg-and-milk custard overnight, so by the time it bakes, every cube is tender and custardy inside with crisp golden edges on top. Because you assemble everything the night before, Christmas morning needs nothing from you but turning on the oven. It’s also a natural fit for a crowd: one 9×13-inch dish feeds eight, travels well to a potluck brunch, and pairs with whatever else lands on your table, from a fruit salad to a plate of cookies. And unlike a plate of individual egg dishes, there’s no standing at the stove while everyone else opens stockings. The oven does the work; you get to sit down with your coffee.

Whole-Grain Bread, Turkey Sausage and Easy Swaps

Good bread matters here, so choose a sturdy loaf of whole-grain bread and let it sit out a day, or toast the cubes briefly, so they can drink in the custard without turning to mush. Turkey breakfast sausage is well seasoned and widely available; mild pork sausage or leftover roast turkey works just as well. Sweet bell pepper and onion add color and sweetness, and a poblano or a handful of mushrooms can step in if that’s what you have. For the cheese, sharp cheddar gives the bake its tangy backbone, though Gruyère or pepper Jack are delicious stand-ins. Whole milk makes the richest custard, but 2% works fine, and for an extra-luxurious set you can swap half a cup of heavy cream in for some of the milk. A teaspoon of dry mustard sounds like a small thing, but it wakes up every other flavor. Salt, pepper, and you’re set.

Tips for a Perfect Christmas Breakfast Casserole

A few small moves make a big difference. First, cut the bread into one-inch cubes rather than slices; cubes soak evenly and bake into pockets of custard. Second, press the assembled casserole gently with a spatula after you pour in the eggs so the top layer soaks too. Third, give it the full eight hours — overnight is easiest; a proper soak is what separates a custardy bake from dry bread pudding. Fourth, bake it straight from the refrigerator, covered, for the first thirty minutes. You don’t need to bring it to room temperature, and the covered start keeps the top from browning before the center sets. Then uncover, add the last of the cheese, and bake until it puffs and a knife slips in clean, about 160°F in the middle. Finally, let it stand ten minutes before cutting. That rest lets the custard settle so your slices hold together on the plate.

Storing and Serving Your Christmas Breakfast Casserole

Leftovers keep beautifully: cover the dish or transfer slices to an airtight container and refrigerate for up to four days. Reheat single portions in the microwave, or warm the whole pan, covered, in a 325°F oven until heated through. The baked casserole also freezes well for up to two months; thaw it overnight in the refrigerator before reheating. As for serving, keep it simple and let the casserole be the star. Fresh fruit, a pitcher of orange juice or a pot of coffee, and maybe warm rolls are all you need. If you’re feeding a bigger group, a green salad with a bright vinaigrette cuts through the richness nicely. Set the dish in the middle of the table with a stack of plates and let everyone help themselves.