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If you are on the lookout for a brunch sensation that combines buttery richness, savory sausage, and aromatic sage in one irresistible dish, then you have to try this Sausage and Sage Croissant Breakfast Casserole Recipe. It’s a feast of tender croissant pieces soaked in a luscious custard, studded with flavorful sausage and fresh herbs, then baked to golden perfection. Every bite bursts with layers of comforting textures and savory goodness, making it the ultimate crowd-pleaser for breakfast, brunch, or even a cozy dinner.

Ingredients You’ll Need

The image shows a close-up of cooked ground meat mixed with small pieces of green onions, all in a black pan. A wooden spatula with a smooth texture lies on top of the meat, slightly lifting some of it. The meat is light brown and crumbly in texture, with bits of green onion scattered throughout, adding small bright green spots to the dish. The cooking pan's surface is dark with some slight shine from oil or moisture. photo taken with an iphone --ar 4:5 --v 7

This recipe uses simple yet remarkably effective ingredients that each bring something special to the table. From flaky croissants that create a tender base to the fresh sage that adds bright, earthy notes, every item works in harmony to make this casserole unforgettable.

Butter (1-2 tablespoons, softened): Used to grease the baking dish for a non-stick surface and adds a subtle richness.
Croissants (1 pound, split in half lengthwise): The star of the dish, their flaky texture soaks up the custard beautifully.
Vegetable oil (1 tablespoon): Helps brown the sausage evenly without overpowering the flavor.
Scallions (1 bunch, thinly sliced white and light green parts): Adds a fresh mild onion flavor and a hint of crunch.
Sweet Italian sausage (3/4 pound, casings removed): Brings hearty, savory depth with just the right amount of seasoning.
Fresh sage (2 teaspoons plus 1 tablespoon for garnish, finely chopped): Imparts an earthy, aromatic lift that perfectly complements the sausage.
Large eggs (8, at room temperature): Bind everything together into a creamy custard.
Whole milk (3 cups): Creates a rich, smooth texture for the custard base.
Heavy cream (1 cup): Adds luscious creaminess to the custard, making the casserole luxuriously tender.
Gruyère cheese (8 ounces, grated): Melts into a nutty, gooey delight that crowns the casserole.
Salt (1 1/4 teaspoons): Enhances every ingredient’s natural flavor without overpowering.
Black pepper (1 teaspoon): Adds just a hint of warmth and mild heat to balance the richness.

How to Make Sausage and Sage Croissant Breakfast Casserole Recipe

Step 1: Prepare and Toast Croissants

Start by greasing your 9×13 inch baking dish with softened butter to ensure the casserole doesn’t stick. Preheat your oven to 350ºF. Next, lay your croissant halves cut side up on a baking sheet and toast them briefly until they just turn golden, about 2 to 4 minutes. This step is key because it helps the croissants hold their shape and absorb the custard without getting soggy. Once toasted, allow them to cool slightly, then tear into bite-sized pieces for the casserole base.

Step 2: Cook the Sausage and Aromatics

In a skillet heated over medium-high, add vegetable oil and the sausage after removing its casing. Brown the sausage thoroughly while breaking it up into crumbles for even cooking and that perfect meaty texture. When the sausage is nicely caramelized, stir in the sliced scallions and chopped fresh sage, letting the scallions soften and the aromas meld together. This savory mix will become the flavorful heart of your casserole.

Step 3: Combine Croissants with Sausage Mixture

Transfer your toasted croissant pieces to a large mixing bowl, then pour in the cooled sausage and scallion mixture. Toss everything together so each piece gets generously coated with those savory bits. This step ensures every bite of your casserole will have an even distribution of rich sausage and bright herbs.

Step 4: Whisk the Custard and Assemble

In another bowl, whisk together eggs, whole milk, heavy cream, half of your grated Gruyère cheese, salt, and black pepper until the custard is smooth and well combined. Spread the croissant and sausage mixture evenly in your prepared baking dish and gently pour the custard over it. Press down lightly on the croissants to help them soak up the liquid. Cover with plastic wrap and refrigerate for at least 4 hours or overnight—this resting time ensures maximum custard absorption and flavor melding.

Step 5: Bake Your Casserole

When you’re ready to bake, preheat the oven again to 350ºF. Remove the plastic wrap and sprinkle the remaining Gruyère cheese generously over the top. Bake the casserole for about 45 minutes until it’s set, golden brown, and firm to the touch. Let it rest for 10 minutes after baking to allow the custard to fully set, which makes slicing easier and enhances the flavors.

Step 6: Garnish and Serve

Finally, sprinkle the casserole with the reserved green parts of the scallions and the remaining tablespoon of fresh chopped sage to add a pop of color and fresh herbal brightness. Now you’re ready to impress at breakfast or brunch with your warm, comforting Sausage and Sage Croissant Breakfast Casserole Recipe!

How to Serve Sausage and Sage Croissant Breakfast Casserole Recipe

A white baking dish filled with a baked layered casserole, showing a golden brown top with melted cheese and scattered green chopped herbs evenly spread over the surface. The casserole layers are slightly crisped on the edges, with visible chunks of browned ingredients beneath the cheese, giving it a textured, rich look. The baking dish is placed on a white marbled surface, and a small round bowl with extra green herbs is seen nearby. The overall dish appears warm and freshly cooked with a hearty, savory feel. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Fresh herbs like chopped sage and sliced green scallion tops add vibrant color and an extra burst of aromatic flavor that balances the richness of the casserole. A light sprinkle of freshly cracked black pepper right before serving can also add a subtle kick that wakes up the palate.

Side Dishes

Pair this rich and hearty casserole with fresh fruit salad for a sweet contrast, or a crisp green salad dressed with lemon vinaigrette to bring brightness to your meal. Roasted tomatoes or sautéed mushrooms also make fabulous savory sides that complement the sage and sausage flavors wonderfully.

Creative Ways to Present

Serve the casserole straight from the baking dish for casual comfort, or cut it into individual portions and plate them elegantly with a garnish of microgreens and a drizzle of herb-infused olive oil. You can also offer small bowls of assorted mustards or chutneys on the side for guests to customize their bites.

Make Ahead and Storage

Storing Leftovers

Store any leftover casserole in an airtight container and refrigerate for up to 3 days. It holds up beautifully and keeps its creamy texture, so it makes for an easy, ready-to-reheat breakfast or snack.

Freezing

This casserole freezes well either before or after baking. If freezing after assembly but before baking, cover it tightly and freeze for up to 1 month. Thaw overnight in the refrigerator before baking as directed. If freezing cooked leftovers, portion into airtight containers and freeze for up to 2 months.

Reheating

Reheat leftovers gently in a 350ºF oven for about 15-20 minutes or until warmed through. To prevent drying, cover loosely with foil. You can also microwave individual portions but the oven method keeps the crust irresistibly tender and the filling creamy.

FAQs

Can I use other types of bread instead of croissants?

Absolutely! While croissants offer a buttery, flaky texture that elevates this casserole, you can substitute with brioche or even day-old French bread cubes for a different but still delicious result.

Is it possible to make this casserole vegetarian?

Yes! Simply swap the sweet Italian sausage for hearty sautéed mushrooms, crumbled tempeh, or plant-based sausage alternatives while keeping the sage and other ingredients the same for a flavorful vegetarian version.

How long can I refrigerate the assembled casserole before baking?

For best results, refrigerate the assembled casserole for at least 4 hours, but it can be kept covered for up to 24 hours. This resting time lets the custard soak into the croissants perfectly.

What cheese alternatives can I use if I don’t have Gruyère?

Gruyère adds a wonderful nutty flavor, but you can substitute with sharp cheddar, fontina, or a mild Swiss cheese depending on your taste preferences and availability.

Can I double this recipe for a larger crowd?

Yes! You can easily double the ingredients and use a larger baking dish or two pans. Just keep the baking time similar but check for doneness with a toothpick or by ensuring the casserole feels firm to the touch.

Final Thoughts

This Sausage and Sage Croissant Breakfast Casserole Recipe is one of those hearty, soul-satisfying dishes that brings everyone around the table with smiles. Its remarkable combination of textures and flavors, from flaky pastry to savory sausage and fragrant sage, will quickly make it a go-to recipe for your special mornings. Don’t wait—gather your ingredients and start building this delicious tradition today!

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