Overnight Croissant Breakfast Casserole
A delicious and easy make-ahead brunch dish featuring custardy croissant pieces soaked in a sweet-spiced egg mixture, baked to golden perfection.
I’ve made this overnight croissant breakfast casserole several times for holiday mornings and sleepy weekend brunches — the custardy, flaky croissant pieces soak up a sweet-spiced egg mixture, then bake to golden, slightly crisped perfection. It’s ideal when you want a show-stopping dish with minimal morning effort and plenty of make-ahead calm.
If you like make-ahead egg bakes with a sweet-savory edge, this pairs nicely with my maple turkey bacon pancake mix approach for a brunch spread — see the maple-turkey bacon pancake casserole here: Maple-Turkey Bacon Pancake Mix Breakfast Casserole.
Why you’ll love this dish
This casserole bridges croissant decadence and classic breakfast strata. You get crisp, buttery edges from the croissants, a creamy interior from the egg custard, and a chance to add melty cheese or salty sausage for contrast. It’s low-effort in the morning (assemble the night before), scales easily for a crowd, and feels special — perfect for holiday breakfasts, overnight guests, or when you want to simplify a busy morning.
The cooking process explained
Quick overview so you know what to expect: tear croissants, whisk a spiced egg-and-milk custard, layer croissant chunks in a greased pan, add cheese and optional cooked meat, pour the custard over, cover and refrigerate overnight. In the morning, bake uncovered at 350°F until puffed and set. If you want more make-ahead ideas and other breakfast-style bakes, check a collection of similar recipes in this breakfast recipes collection.
Gather these items
- 6 large croissants, torn into pieces (day-old or slightly stale works best)
- 8 large eggs
- 2 cups milk (whole milk for richness; 2% works too)
- 1 cup shredded cheese (Gruyère or sharp cheddar recommended)
- 1/2 cup cooked and crumbled sausage or turkey bacon (optional; drain excess grease)
- 1/4 cup sugar (reduce or omit for fully savory versions)
- 1 teaspoon vanilla extract
- 1 teaspoon cinnamon
- Salt and pepper to taste
Substitution notes:
- For a dairy-free option, use unsweetened almond or oat milk and a dairy-free cheese; texture will be slightly different.
- Stale croissants absorb custard better; if yours are very fresh, tear and toast lightly for 5–7 minutes to dry them out a touch.
Directions to follow
- Whisk the custard: In a large bowl, whisk together the 8 eggs, 2 cups milk, 1/4 cup sugar, 1 teaspoon vanilla, 1 teaspoon cinnamon, and a pinch each of salt and pepper until smooth.
- Layer croissants: Grease a 9×13-inch baking dish and scatter the torn croissant pieces evenly across the pan.
- Add mix-ins: Sprinkle the cooked, crumbled sausage or turkey bacon and 1 cup shredded cheese over the croissants, if using.
- Soak: Pour the egg mixture evenly over the croissants and gently press the croissant pieces down so they absorb the custard.
- Chill overnight: Cover tightly with plastic wrap or foil and refrigerate for at least 6–8 hours (overnight is best).
- Bake: The next morning, preheat the oven to 350°F (175°C). Remove cover and bake uncovered for 30–40 minutes, until the top is puffed, golden, and the center is set (an internal temperature of 160°F is a safe target for egg dishes).
- Rest and serve: Let the casserole cool for 5–10 minutes before slicing and serving.
Overnight Croissant Breakfast Casserole
- Prep
- 20 MIN
- Cook
- 35 MIN
- Total
- 55 MIN
- Serves
- 8
01Ingredients
Main Ingredients
Custard Components
02Method
- Preparation
- Baking
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0 OF 8 DONE03Recipe notes
- 01For a dairy-free option, use unsweetened almond or oat milk and a dairy-free cheese. Store leftovers in an airtight container in the fridge for up to 3–4 days.
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Best ways to enjoy it
- Serve with a simple green salad and a glass of orange juice for a brunch that feels balanced.
- Offer maple syrup, berry compote, or a dusting of powdered sugar for those who prefer sweeter bites.
- For savory service, top with chopped chives and a side of roasted tomatoes or sautéed mushrooms.
- Cut into squares and present with small forks for buffet-style serving; it’s also great plated with a fried egg on top for extra richness.
How to store & freeze
Refrigerate: Store leftovers in an airtight container in the fridge for up to 3–4 days. Reheat in a 325°F oven until warmed through (about 10–15 minutes) to maintain texture, or microwave individual portions for 60–90 seconds.
Freeze: Wrap individual portions tightly in plastic wrap and foil, or store in freezer-safe containers for up to 2 months. Thaw overnight in the fridge and reheat in a 350°F oven for best texture.
Food safety: Keep the assembled, soaked casserole refrigerated; do not leave it at room temperature for more than 2 hours before baking.
Creative twists
- Sweet berry version: Omit meat, reduce sugar to 2 tablespoons, and fold in fresh berries or a handful of chocolate chips before baking. Finish with a maple drizzle.
- Cheesy herb: Swap Gruyère for fontina, add chopped fresh thyme and baby spinach for a savory brunch centerpiece.
- Mediterranean: Use feta, sun-dried tomatoes, and oregano; skip the sugar and vanilla.
- Turkey ham-and-cheddar: Replace sausage with diced turkey ham and use sharp cheddar for a diner-style flavor.
- Mini croissant bakes: Bake in a greased muffin tin for portable, portioned servings — perfect for packed breakfasts.
Your questions answered
Can I assemble and bake the same day instead of overnight?
A: Yes. If you’re short on time, let the casserole sit at room temperature for 20–30 minutes after assembling so the croissants begin to absorb the custard, then bake. The overnight chill improves texture and flavor but isn’t strictly necessary.
What if I don’t have croissants — can I use regular bread?
A: Stale brioche or challah are excellent substitutes; they mimic croissant richness. Sandwich bread will work in a pinch but won’t be as buttery.
Can I make this dairy-free or egg-free?
A: For dairy-free, use a plant milk and dairy-free cheese, though texture changes. Egg-free versions aren’t recommended — eggs are the structure of the custard — but you could experiment with silken tofu blended with a little flour/starch and plant milk as a binder (results will differ).
How can I make this ahead for a large crowd?
A: Double the recipe and use two 9×13 pans. Assemble the night before and bake both pans simultaneously in the morning; rotate if your oven has hot spots.
Is the sugar necessary?
A: The 1/4 cup sugar adds a subtle sweetness that balances savory mix-ins and enhances the custard. For a fully savory dish, reduce or omit it.
Conclusion
For more ideas, check out Overnight Breakfast Bake – Croissant Breakfast Bake and my Overnight Croissant Breakfast Casserole.
Breakfast
Breakfast
Breakfast
