If you love waking up to a breakfast that feels both comforting and a bit fancy, the Sausage and Sage Croissant Breakfast Casserole Recipe is about to become your new favorite. This dish is a glorious blend of flaky, buttery croissants soaked in a rich, cheesy custard infused with savory Italian sausage and the earthy brightness of fresh sage. Every bite brings together warm, tender textures with bold, layered flavors that make it perfect for weekend brunches, holiday mornings, or any day when breakfast deserves a little extra celebration.
Ingredients You’ll Need
Putting together this casserole is delightfully simple, and each ingredient is carefully chosen to build layers of flavor and texture. From the buttery croissants that provide a tender base to the Gruyère cheese that melts into luscious pockets of goodness, every element plays an essential role.
- Butter (1-2 tablespoons): Use softened butter to generously grease your baking dish, ensuring the casserole doesn’t stick and adds subtle richness.
- Croissants (1 pound, about 5 to 7): These flaky, buttery pastries make a perfect base, creating a tender yet crisp texture after baking.
- Vegetable oil (1 tablespoon): Needed to cook the sausage evenly without burning or sticking.
- Scallions (1 bunch, 6 to 7): The white and light green parts add delicate onion flavor, while the greens brighten the final presentation.
- Sweet Italian sausage (3/4 pound): Adding a savory, slightly spicy punch, this sausage is the star protein that balances the creamy custard.
- Fresh sage (3 teaspoons total, finely chopped): This herb infuses the casserole with an earthy, aromatic note, elevating every mouthful.
- Eggs (8 large): They form the custard’s foundation, binding the ingredients and creating a silky texture.
- Whole milk (3 cups): Adds creaminess to the custard without overpowering the other flavors.
- Heavy cream (1 cup): Ensures a luscious richness that makes this casserole feel indulgent but balanced.
- Gruyère cheese (2 cups, grated, divided): This nutty, melting cheese gives the casserole richness and a golden crust on top.
- Salt (1 1/4 teaspoons) and black pepper (1 teaspoon): Simple seasonings that enhance every other ingredient without overshadowing them.
How to Make Sausage and Sage Croissant Breakfast Casserole Recipe
Step 1: Grease and Preheat
Start by generously buttering a 9×13 inch baking dish. This little step ensures your casserole won’t stick and adds an extra layer of buttery flavor as it bakes. Preheat your oven to 350ºF (177ºC) so it’s ready once your casserole is assembled.
Step 2: Toast the Croissants
Arrange the croissant halves cut side up on a baking sheet and toast them lightly for 2 to 4 minutes until they turn a lovely golden color. This brief toasting makes sure they hold their shape and absorb all the custardy goodness later without becoming soggy.
Step 3: Cook the Sausage
Heat vegetable oil in a skillet over medium-high heat, then add the sweet Italian sausage, breaking it into small pieces. Cook until browned and cooked through, about 6 to 8 minutes. This step builds deep flavor and a delightful, meaty texture.
Step 4: Add Scallions and Sage, Then Cool
Stir in the sliced white and light green parts of the scallions, cooking just until softened to add subtle aromatic notes. Sprinkle in the fresh sage and remove the skillet from heat. Let the sausage mixture cool for 7 to 10 minutes to prevent scrambling the eggs in the next steps.
Step 5: Combine Croissants with Sausage Mixture
In a large bowl, gently toss the toasted croissant pieces with the cooled sausage and scallion blend. This ensures every bite is packed with flavor and that the croissants soak up a little bit of the sausage’s savory goodness.
Step 6: Whisk the Egg Custard
In a separate large bowl, whisk together the eggs, whole milk, heavy cream, most of the Gruyère cheese (reserving 1/2 cup), salt, and pepper until smooth and combined. This creamy custard is what will bind the casserole and infuse the croissants with rich, gooey indulgence.
Step 7: Assemble and Refrigerate
Pour the croissant and sausage mixture into the buttered baking dish, spreading it evenly. Slowly pour the custard over the top, gently pressing the croissants down so they soak up as much liquid as possible. Cover tightly with plastic wrap and refrigerate for at least four hours or overnight, allowing the flavors to meld beautifully.
Step 8: Bake to Perfection
When ready, preheat the oven again to 350ºF (177ºC). Remove the plastic wrap, sprinkle the reserved Gruyère cheese evenly on top, and bake uncovered for about 45 minutes. The casserole will turn a gorgeous golden brown, with a firm center and bubbly, cheesy crust. Let it rest for 10 minutes before serving to set up perfectly.
How to Serve Sausage and Sage Croissant Breakfast Casserole Recipe
Garnishes
Fresh garnishes elevate this dish from delicious to unforgettable. Sprinkle the reserved scallion greens and a tablespoon of fresh chopped sage over the top just before serving for a pop of color and a burst of bright, herbal aroma that cuts through the richness wonderfully.
Side Dishes
This casserole pairs beautifully with simple, crisp sides to balance its richness. A fresh mixed green salad with a light vinaigrette, roasted tomatoes, or even some bright fruit salad helps create a well-rounded breakfast or brunch spread.
Creative Ways to Present
Try serving the casserole in individual ramekins for an elegant touch, perfect for brunch parties. You can also drizzle a little bit of hot honey or a tangy mustard sauce on the side to complement the sausage’s savory notes and add an unexpected twist.
Make Ahead and Storage
Storing Leftovers
Wrap leftover casserole tightly with foil or transfer to an airtight container and refrigerate. It will keep fresh for up to 3 days and tastes fantastic reheated for an easy next-day meal.
Freezing
This casserole freezes well. After baking, let it cool completely, then wrap it tightly in plastic wrap and foil or place in a freezer-safe container. Freeze for up to 2 months. Thaw overnight in the fridge before reheating for best results.
Reheating
Warm leftovers in a 350ºF oven for 15 to 20 minutes until heated through. Cover loosely with foil to prevent drying out. You can also microwave individual portions gently, but the oven method helps maintain the casserole’s lovely texture.
FAQs
Can I use store-bought cooked sausage instead of fresh Italian sausage?
Yes, you can substitute with cooked sausage, but be mindful of added seasonings or salt in the pre-cooked version. The fresh Italian sausage adds the freshest flavor and best texture to the casserole.
Is it okay to use day-old croissants for this recipe?
Absolutely! Day-old croissants actually work great because they’re a bit drier and soak up the custard nicely without falling apart during cooking.
Can I prepare this casserole vegan or dairy-free?
This recipe relies on dairy and eggs for richness and structure, so it would need significant modifications to become vegan or dairy-free, such as using plant-based alternatives for milk, cream, and cheese, plus an egg substitute.
What if I don’t have fresh sage? Can I use dried?
Fresh sage offers a brighter, more vibrant flavor, but if you only have dried sage, use about one-third the amount and add it earlier in the cooking process so it has time to develop its flavor.
How far ahead can I assemble the casserole before baking?
The casserole can be prepared and refrigerated for up to 24 hours before baking. This makes it perfect for preparing the night before a special breakfast or brunch.
Final Thoughts
If you’re searching for a show-stopping breakfast that’s surprisingly easy to make, the Sausage and Sage Croissant Breakfast Casserole Recipe is your ticket. Its combination of flaky croissants, savory sausage, fresh herbs, and melty cheese creates a dish that feels like a warm hug on a plate. Give it a try—you’ll soon see why it’s such a beloved recipe to share with family and friends!
Print
Sausage and Sage Croissant Breakfast Casserole Recipe
- Prep Time: 15 minutes
- Cook Time: 50 minutes
- Total Time: 5 hours 5 minutes
- Yield: 12 servings
- Category: Breakfast Casserole
- Method: Baking
- Cuisine: American
Description
This Sausage and Sage Croissant Breakfast Casserole is a savory, custardy bake perfect for brunch or a hearty breakfast. Featuring flaky croissants soaked in a rich egg custard with browned sweet Italian sausage, fresh sage, scallions, and melty Gruyère cheese, this casserole offers a delightful blend of textures and flavors. Prepared ahead and baked until golden, it makes a comforting and crowd-pleasing dish.
Ingredients
Butter and Oil
- 1–2 tablespoons butter, softened
- 1 tablespoon vegetable oil
Bakery
- 1 pound croissants (about 5 to 7), split in half lengthwise
Meat
- 3/4 pound sweet Italian sausage, casings removed
Produce
- 1 bunch scallions (6 to 7), white and light green parts thinly sliced, greens reserved
- 2 teaspoons fresh sage, finely chopped (plus 1 tablespoon for garnish)
Dairy
- 8 large eggs, at room temperature
- 3 cups whole milk
- 1 cup heavy cream
- 1 1/2 cups Gruyère cheese, grated (reserve 1/2 cup for topping)
Seasonings
- 1 1/4 teaspoons salt
- 1 teaspoon black pepper
Instructions
- Grease Baking Dish: Use 1-2 tablespoons of softened butter to generously grease a 9×13 inch baking dish. Set it aside and preheat your oven to 350ºF (177ºC).
- Toast Croissants: Arrange croissant halves cut side up on a large baking sheet. Bake for 2 to 4 minutes until golden brown, then remove and let cool until manageable. Tear the croissants into large bite-sized pieces.
- Cook Sausage: Heat 1 tablespoon vegetable oil in a skillet over medium-high heat. Add the sweet Italian sausage, cooking and crumbling it until well browned and cooked through, about 6-8 minutes.
- Add Scallions: Stir in the sliced white and light green scallion parts into the sausage mixture. Continue cooking until scallions are softened.
- Incorporate Sage and Cool: Mix in 2 teaspoons of finely chopped fresh sage. Remove the skillet from heat and let the sausage mixture cool for 7-10 minutes to avoid cooking the eggs later.
- Combine Croissants and Sausage Mixture: In a large bowl, toss together the toasted croissant pieces and cooled sausage mixture to evenly distribute flavors.
- Prepare Egg Custard: In a separate large mixing bowl, whisk together 8 large eggs, 3 cups whole milk, 1 cup heavy cream, 1 1/2 cups grated Gruyère, 1 1/4 teaspoons salt, and 1 teaspoon black pepper until fully combined and smooth.
- Assemble Casserole: Pour the croissant and sausage mixture into the buttered baking dish and spread evenly. Pour the egg mixture over the top, gently pressing down the croissants so they absorb the liquid well.
- Refrigerate: Cover the assembled casserole tightly with plastic cling wrap. Refrigerate for at least 4 hours or overnight to let the custard soak thoroughly into the croissants and flavors meld.
- Preheat Oven for Baking: When ready to bake, preheat your oven again to 350ºF (177ºC).
- Bake Casserole: Remove the plastic wrap. Sprinkle the remaining 1/2 cup Gruyère cheese on top of the casserole. Bake uncovered for about 45 minutes or until the top is golden brown and the center is firm to the touch. Remove from oven and let sit for 10 minutes before serving.
- Garnish and Serve: Top the casserole with the reserved scallion greens and 1 tablespoon of chopped fresh sage for a fresh accent. Serve warm and enjoy your flavorful breakfast casserole.
Notes
- For best flavor, use fresh sage and high-quality Gruyère cheese.
- Allowing the casserole to soak in the fridge overnight helps the croissants absorb the custard fully, resulting in a creamy texture.
- Use room temperature eggs to ensure a smooth custard.
- This casserole can be reheated in the oven at 350ºF for 15-20 minutes before serving.
- For a spicier version, substitute sweet Italian sausage with hot Italian sausage.
