Overnight Breakfast Casserole with Sausage and Bread

Name: Overnight Breakfast Casserole with Sausage and Bread
Prep time: 20 min
Cook time: 50 min
Total time: 550 min
Ingredients: 12 large eggs; 2 cups whole milk or half-and-half; 6 cups day-old rustic bread, cubed — French or sourdough work beautifully; 1 lb breakfast sausage, cooked and crumbled; 1 small onion, diced; 1 bell pepper, diced — red or green for a festive touch; 2 cups shredded cheese — a mix of cheddar and Gruyère or Swiss (8 ounces ); 1 Tbsp Dijon mustard — the secret tang; 1 Tbsp pure maple syrup — for that cozy sweet-savory balance; 2 tsp salt; 1 tsp black pepper, freshly ground; 2 Tbsp fresh herbs — chopped parsley, thyme, or rosemary (ior 2 teaspoons of dried Italian herbs); 1/4 tsp red pepper flakes

Jump to Instructions

This recipe got a full refresh on August 31, 2026. I fixed the printable recipe card (turns out it was missing the actual instructions), added a toasting step for the bread that makes a real difference in texture, and reworked it as a year-round make-ahead breakfast. Same dish you’ve always loved — just clearer, more complete, and easier to follow.

This overnight breakfast casserole with bread is the make-ahead breakfast I reach for anytime we need to feed a crowd without an early alarm. It works just as well feeding a full table as it does tucked in the freezer for a fast weekday morning. Sausage, cheese, a little maple-Dijon tang — it goes together the night before and bakes while the coffee’s still perking.

A Little Story from the Country Kitchen

This casserole started as a Christmas morning tradition. Every Christmas Eve, Rick and I drive home after saying our goodbyes at the family gathering — one more Tom and Jerry for the road — and before I turn in, I pull out the casserole dish and put this together. By the time I wake up, half the work is already done.

But it hasn’t stayed a once-a-year thing. These days I make it any time we’ve got reason for a family breakfast — birthdays, someone visiting, a Sunday when everyone happens to be around. With a family the size of ours, anything I can make the night before is one less thing standing between me and actually sitting down with everyone instead of working the whole morning. I usually put it out alongside banana bread or cardamom cinnamon rolls, so there’s a savory option and a sweet one and nobody’s left picking at just one dish.

It’s the kind of recipe that does the work for you. Just remember to start it the night before.

Overnight Breakfast Casserole with sausage and bread baked in a glass dish with sausage, cheese, and bell peppers, cut into squares with one serving on a white plate beside it on a rustic wooden table.

Table of Contents

Why You’ll Love This

Make it the night before, bake it while the coffee brews. Feeds a crowd without a scramble. Sausage, cheese, and that maple-Dijon twist do a lot of the work — savory with just enough sweetness to feel a little special. Bakes into a casserole that holds together in clean squares, not something that falls apart when you cut it. Freezes well if you want to make it twice — once for now, once for later.

When you’re leaning into winter comfort food, don’t miss my cozy Creamy Potato Soup too — it’s a bowlful of warmth for cold December days.

Ingredients

12 large eggs — fresh from your hens if you’ve got them 🐓
2 cups whole milk or half-and-half — adds creaminess
6 cups day-old rustic bread, cubed and toasted — French or sourdough work beautifully
1 lb breakfast sausage — cooked and crumbled
1 small onion — diced
1 bell pepper — red or green (festive bonus!)
2 cups shredded cheese, 8oz— a mix of cheddar and Gruyère or Swiss
1 tablespoon Dijon mustard — the “secret” tang
1 tablespoon pure maple syrup — for that sweet-savory balance
2 teaspoons salt
1 teaspoon black pepper — freshly ground
2 tablespoons fresh herbs — chopped parsley, thyme, or rosemary, or optional 2 teaspoons dried Italian herb mix
1/4 teaspoon Red Pepper flakes — add more if you want it to be spicy

Optional Add-Ins:

Sautéed mushrooms
Fresh spinach
A spoonful of homemade mustard relish for a zesty farmhouse variation

Instructions

Prep the Bread and Pan

Toast the ¾- to 1-inch bread cubes at 325°F for 15–20 minutes, stirring or turning them halfway through.
Lightly grease a 9×13-inch baking dish and layer the dish with the toasted bread cubes.

Cook the Savory Stuff

Chopped onion and red bell pepper added to browned breakfast sausage in a cast-iron skillet for overnight breakfast casserole with bread

While the bread cubes are toasting, brown the sausage in a large skillet. Add onion and bell pepper; sauté until tender. Spoon evenly over the bread.

Whisk the Custard

Whisked egg, milk, Dijon, maple syrup, and herb custard mixture for overnight breakfast casserole with bread

In a large bowl, whisk together eggs, milk, Dijon, maple syrup, salt, pepper, red pepper flakes, and herbs. Stir in 1½ cups of cheese (save the rest for topping).

Assemble
Pour the egg mixture evenly over the bread and sausage. Press gently to soak.

Unbaked overnight breakfast casserole layered with toasted bread cubes, sausage, peppers, onion, and egg mixture in a glass dish, ready to refrigerate overnight

Refrigerate Overnight
Cover with plastic wrap or foil and chill for at least 8 hours (up to 24).

Bake in the Morning

Overnight breakfast casserole assembled in a glass baking dish, topped with shredded cheese, bell peppers, onion, and herbs, ready to bake

The next morning, preheat the oven to 350°F (175°C). Remove the dish from the fridge and let it come to room temperature while the oven preheats. Sprinkle the remaining cheese on top. Bake uncovered for 50–55 minutes, until puffed and golden brown.

Rest & Serve
Let it stand 10 minutes before cutting. Sprinkle with chopped green onions or parsley, drizzle with a bit of warm maple syrup if you’re feeling fancy, and serve warm with fresh fruit or cinnamon rolls on the side.

Golden baked overnight breakfast casserole with sausage and bread resting in the pan before serving

Why This Works

Day-old bread is the whole trick here. Fresh bread is too soft — it soaks up the custard and turns to mush instead of holding its shape. Stale bread has room to absorb the eggs and milk without falling apart, which is why the overnight rest matters as much as the bake itself.

I take it one step further and toast the bread cubes too, even after they’ve already gone stale — that’s why it’s step one, not an afterthought.

Stale bread is usually just dry on the surface — the inside is still a little soft — and toasting evens that out all the way through. It also drives off more moisture so the cubes can actually soak up the egg mixture instead of just sitting in it, and it adds a light roasted flavor plain stale bread doesn’t have on its own. The top and edges come out a little more golden and crisp for it too.

Toast the cubes at 325°F for 15 to 20 minutes, stirring halfway through — you’re after dry and lightly crisp, not croutons. Skip this step, and you’re closer to making a savory bread pudding than a breakfast casserole. Still a fine dish, just not the one you set out to make.

The Dijon and maple syrup aren’t there to be tasted on their own — they’re there to balance each other. Without the Dijon, the maple makes the whole dish taste like a dessert. Without the maple, the Dijon is just sharp. Together they disappear into the eggs and cheese, and all you notice is that it tastes a little more finished than a plain sausage-and-egg bake.

What to Expect

This isn’t a jiggly, loose casserole — when it’s done, the center should be set, not wobbly, and the top should be puffed and golden, pulling slightly away from the sides of the dish. If you gently shake the pan and the middle still moves like liquid, it needs more time. It will deflate a little as it cools — that’s normal, not a sign anything went wrong.

Expect it to smell like sausage and warm maple long before it’s actually done. That’s the custard setting, not the finish line.

Overnight Breakfast Casserole (Bread) vs. Farmer’s Casserole (Hash Browns)

	This Casserole	Traditional Farmer’s Casserole
Base	Day-old bread, cubed	Shredded or diced hash browns
Texture	Soft, custardy, bread-pudding-like	Denser, more of a hash-brown bake
Best for	Using up bread, a lighter texture	A heartier, potato-forward breakfast

If you’re looking for a hash-brown-based casserole instead, this isn’t that recipe — but the overnight method works the same way either way.

Tips for the Best Breakfast Casserole

Don’t skip the Dijon — it’s what keeps the maple from tasting like dessert. Use real maple syrup; you’ll taste the difference against the imitation stuff. Dry, day-old bread holds its structure; fresh bread turns mushy. Bake until puffed with no liquid pooling in the center.

Make-Ahead & Freezer Tips

Assemble and refrigerate up to 24 hours ahead. To freeze: bake, cool completely, wrap tightly, and freeze up to 2 months. Thaw overnight in the fridge and reheat at 325°F for about 25 minutes. Individual portions reheat in the microwave in about a minute.

This isn’t just a company-coming casserole. Bake it on a Sunday, freeze it in individual squares, and you’ve got real breakfast for the whole week — not cereal, not a granola bar eaten in the car. Grab a square, microwave it for about a minute, and it’s done before the bus gets to the end of the driveway.

Variations

Vegetarian: skip the sausage, add roasted mushrooms, peppers, or spinach, and a little extra cheese to make up the difference.

Leftover ham: dice up whatever’s left from the holiday ham and swap it in for the sausage — it works especially well the week after Christmas.

Smoky twist: a pinch of smoked paprika or some chopped bacon. Gluten-free: a sturdy gluten-free loaf holds up the same way the rustic bread does.

Spicy twist: swap in Pepper Jack for some of the cheddar.

Serving Ideas

This is the savory anchor — I like to pair it with something sweet so the table has a little of both. Banana bread or Make-Ahead Orange Cardamom Sweet Rolls are my usual go-tos. Fresh fruit or a citrus compote on the side. Coffee with homemade coffee creamer, which varies with the season. Mugs of homemade cocoa for the kids.

Simple Living Tip

Make two whenever you’ve got a full house. One to serve now, one for the fridge or freezer for the next time company shows up — because with a family this size, there’s always a next time.

Shop This Post

9×13 glass baking dish – this baking dish comes with a lid, which makes refrigerating overnight a breeze
Large mixing bowl – I use the set of glass mixing bowls regularly for prepping, mixing, and serving
Whisk – perfect for blending, beating, and whisking
Box grater – Store-bought grated cheese is coated in anti-caking agents. Freshly grated cheese melts more evenly into the eggs and bread
Kitchen scale – I always grate my own cheese, so I weigh it instead of measuring by cup. Store-bought is fine too, but if you’re grating your own, a scale makes it easy to hit the 8 ounces without guessing.

Overnight Breakfast Casserole FAQs

Can I make this the night before?

Yes — that’s the whole point of the recipe and exactly why I love this breakfast casserole. Assemble it, cover it, and refrigerate for at least 8 hours, up to 24. In the morning, let it sit out while the oven preheats, then bake.

Do I need to bring it to room temperature before baking?

Let it sit out on the counter while your oven preheats — about 20–30 minutes. Going straight from the fridge to the oven means the center takes longer to set and the edges can overcook before the middle catches up.

What’s the best way to cover it overnight?

Plastic wrap pressed against the surface works well, or a tight layer of foil. Either way, make sure it’s sealed so the bread doesn’t dry out or pick up other fridge flavors.

Can I freeze this breakfast casserole?

Yes. Bake it fully, let it cool completely, wrap tightly, and freeze up to 2 months. Thaw overnight in the fridge and reheat at 325°F until warmed through.

What kind of bread works best?

A sturdy, day-old loaf — sourdough, French, or Italian. Fresh, soft bread turns mushy once it soaks up the custard; stale bread holds its structure.

How many servings does this make?

This makes 10 servings in a standard 9×13 dish — enough for a full family breakfast with a little left over, whether that’s a holiday morning or just a Sunday everyone happens to be around.

Can I use ham instead of sausage?

Yes, especially good for using up leftover holiday ham. Dice it and swap it in for the cooked sausage.

Can I make this gluten-free?

Swap in a sturdy gluten-free loaf. It holds up the same way the rustic bread does and soaks up the custard without falling apart.

How do I know when it’s fully baked?

The top should be puffed and golden, and the center should be set — not jiggly. If you shake the pan gently and the middle still moves like liquid, give it a few more minutes.

Can I freeze this for weekday breakfasts, not just special occasions?

Yes, that’s actually one of the best uses for it. Bake the full casserole, let it cool completely, then cut it into individual squares before freezing so you can grab just what you need. Reheat one square in the microwave for about a minute for a real breakfast on a school morning, no extra effort required.

A cheesy square of overnight breakfast casserole with sausage and bread served on a white plate beside the baking dish

From My Country Kitchen to Yours

This overnight breakfast casserole is the kind of recipe that lets me enjoy family breakfast gatherings instead of spending them cracking eggs while everyone else drinks coffee. When we have a houseful of adult children and our grandkids, I’d rather enjoy them than be a short-order cook.

I assemble it before I even get into bed, tuck it into the refrigerator, and breakfast is nearly handled before my head hits the pillow. And on quieter mornings — just me, coffee, and somebody racing out the door — a square from the freezer does the same job in under a minute.

Whether you serve it on Christmas morning, for a family brunch, or simply because a full house needs feeding, I hope it becomes one of those dependable recipes you return to year after year. If you make it, leave a comment and let me know — sausage, leftover ham, or a twist of your own?

Simple Living ❤️ Country Style — one make-ahead morning at a time

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