Mouthwatering Croissant Quiche

If you ask me, croissants belong in more than just the bread basket.

This buttery take on quiche swaps out traditional pie crust for torn croissant pieces that soak up a rich custard. Delicate crab and nutty Gruyere cheese make it feel special enough for brunch guests.

The base gets studded with sautéed leeks and garlic cooked in butter until soft. A hint of Old Bay seasoning and a sprinkle of sliced almonds on top give it that extra something.

It’s a showstopper dish that comes together easier than you’d think, perfect for a lazy weekend morning.

What Kind of Crab Should I Use?

For this croissant quiche, you have a few good options when it comes to crab. Lump crab meat is ideal if you want bigger, more noticeable pieces throughout your quiche, while claw meat works great too and tends to be more budget-friendly. If fresh crab isn’t available or feels too pricey, canned crab meat is perfectly fine – just make sure to drain it well and pick through it to remove any shell fragments. You can even use imitation crab in a pinch, though the flavor won’t be quite as rich and seafood-forward as the real thing.

Options for Substitutions

This recipe is pretty adaptable, so here are some swaps you can make if needed:

• Croissants: Croissants are really the star here and give this quiche its special texture, so I’d recommend sticking with them. Day-old croissants actually work even better since they soak up the custard nicely.
• Crab: If crab isn’t available or is too pricey, you can use cooked shrimp, lobster, or even smoked salmon. For a non-seafood version, try cooked bacon, ham, or sautéed mushrooms.
• Gruyere: Swiss cheese is a close match to gruyere and works great here. You could also use sharp white cheddar or fontina for a different flavor profile.
• Leek: No leeks? Use a medium yellow onion or 3-4 shallots instead. They’ll give you a similar mild onion flavor.
• Cream and milk: You can use all half-and-half instead of the cream and milk combo, or go with 2 1/2 cups of whole milk if you want to lighten it up a bit.
• Biscuit mix: If you don’t have biscuit mix, substitute with 1/4 cup all-purpose flour mixed with 1/4 teaspoon baking powder.
• Almonds: Feel free to skip the almonds entirely, or swap them with chopped pecans or walnuts for a different crunch.

Watch Out for These Mistakes While Baking

The biggest mistake with croissant quiche is not pressing the croissants firmly into the pan and sealing the gaps between them, which can cause the egg mixture to leak underneath and create a soggy bottom instead of a crispy crust.

Another common error is pouring the egg mixture too quickly or filling the pan too full – add it slowly and stop when it reaches about three-quarters up the sides, as the quiche will puff up during baking and could overflow.

Make sure your leeks are completely cooked down and any excess moisture has evaporated before adding them to the quiche, since watery vegetables will make your filling runny and prevent it from setting properly.

Finally, resist the urge to slice into your quiche right away – letting it cool for at least 15 minutes allows the custard to firm up, making it much easier to cut clean slices without everything falling apart.

What to Serve With Croissant Quiche?

This croissant quiche is pretty rich and filling on its own, so I like to keep the sides simple and fresh. A light arugula salad with lemon vinaigrette is perfect for cutting through all that buttery goodness, or you could go with mixed greens tossed with a tangy mustard dressing. Fresh fruit like melon, berries, or sliced citrus makes a great addition to brunch and adds a refreshing contrast to the creamy quiche. If you’re serving this for a crowd, consider adding some roasted asparagus or a simple tomato salad on the side.

Storage Instructions

Store: Keep leftover croissant quiche covered with foil or plastic wrap in the fridge for up to 3 days. The croissants will soften a bit as they sit, but the flavors actually get better overnight as everything melds together.

Freeze: You can freeze individual slices wrapped tightly in plastic wrap and then placed in a freezer bag for up to 2 months. This makes it super easy to grab a slice whenever you need a quick breakfast or brunch option.

Reheat: Warm up slices in a 350°F oven for about 15-20 minutes until heated through, or microwave individual portions for 1-2 minutes. The oven method helps keep the croissants from getting too soggy and brings back some of that nice texture.

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 3800-4100
• Protein: 160-180 g
• Fat: 260-290 g
• Carbohydrates: 190-215 g

Ingredients

For the crust:

• 8 croissants (torn into 1-inch pieces to form a textured base)
• 1/3 cup sliced almonds

For the filling:

• 1 large leek (white and light green parts only, thinly sliced)
• 4 tbsp butter (I like Kerrygold unsalted butter for this)
• 3 garlic cloves
• 1 tbsp tomato paste
• 1/2 tsp seafood seasoning (I use Old Bay for the most authentic flavor)
• 5 oz gruyere (shredded, about 1 1/4 cups total)
• 10 oz crab
• 1/2 tsp salt
• 1/4 tsp white pepper
• Pinch of freshly grated nutmeg

For the custard:

• 6 large eggs
• 1 1/2 cups heavy cream
• 1 1/4 cups milk
• 1/4 cup biscuit mix (I always use King Arthur Baking Company mix for a better rise)

Step 1: Prepare the Croissant Base and Toast the Almonds

• 8 croissants, torn into 1-inch pieces
• 1/3 cup sliced almonds

Preheat your oven to 350°F.

While it heats, tear the croissants into roughly 1-inch pieces—you want a mix of sizes to create a textured, rustic base rather than uniform cubes.

Arrange the pieces evenly in a greased 9×13 inch baking dish or similar size, pressing them down gently so they hold together but still maintain their flaky texture.

Spread the sliced almonds on a small baking sheet and toast them in the oven for 5-7 minutes until fragrant and lightly golden, then set aside.

This toasting step brings out their nutty flavor and prevents them from becoming soggy in the custard.

Step 2: Build the Seafood and Leek Filling

• 4 tbsp butter
• 1 large leek, thinly sliced
• 3 garlic cloves, minced
• 1 tbsp tomato paste
• 10 oz crab
• 5 oz gruyere, shredded
• 1/2 tsp seafood seasoning
• 1/2 tsp salt
• 1/4 tsp white pepper
• Pinch of freshly grated nutmeg

Melt the butter in a large skillet over medium heat.

Add the thinly sliced leeks and cook for 8-10 minutes, stirring occasionally, until they’re completely soft and starting to turn golden—this develops their natural sweetness.

Mince the garlic cloves and add them to the pan along with the tomato paste, cooking for 1-2 minutes until fragrant and the tomato paste darkens slightly.

Stir in the crab, shredded gruyere, seafood seasoning, salt, white pepper, and nutmeg, mixing gently to avoid breaking up the crab meat too much.

I like to taste at this point to adjust seasoning—the seafood seasoning should be noticeable but balanced, not overpowering.

Step 3: Assemble the Filling and Custard Base

• seafood and leek filling from Step 2
• 6 large eggs
• 1 1/2 cups heavy cream
• 1 1/4 cups milk
• 1/4 cup biscuit mix
• toasted almonds from Step 1

Spread the warm seafood and leek filling from Step 2 evenly over the croissant base in the baking dish.

In a blender, combine the eggs, heavy cream, and milk, blending for about 20 seconds until well combined and smooth.

Add the biscuit mix and blend for another 10-15 seconds just until incorporated—don’t overmix, as this can develop gluten and make the quiche less tender.

Pour this custard mixture slowly and evenly over the filling, making sure it seeps down between the croissant pieces.

Scatter the toasted almonds from Step 1 over the top.

Step 4: Bake and Cool

Place the assembled quiche in the preheated 350°F oven and bake for 30-35 minutes until the custard is set and the top is lightly golden—the center should still have a slight jiggle when you gently shake the pan, as it will continue to set as it cools.

Remove from the oven and let it cool for at least 10-15 minutes before slicing; I find this resting time helps the quiche hold together better when served, and it allows the flavors to meld beautifully.

Serve warm or at room temperature.

Mouthwatering Croissant Quiche

Delicious Mouthwatering Croissant Quiche recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 35 minutes mins

Total Time 57 minutes mins

Servings: 6 servings

Calories: 3950

Ingredients Method

Ingredients

  

For the crust::

• 8 croissants (torn into 1-inch pieces to form a textured base)
• 1/3 cup sliced almonds

For the filling::

• 1 large leek (white and light green parts only, thinly sliced)
• 4 tbsp butter (I like Kerrygold unsalted butter for this)
• 3 garlic cloves
• 1 tbsp tomato paste
• 1/2 tsp seafood seasoning (I use Old Bay for the most authentic flavor)
• 5 oz gruyere (shredded, about 1 1/4 cups total)
• 10 oz crab
• 1/2 tsp salt
• 1/4 tsp white pepper
• Pinch of freshly grated nutmeg

For the custard::

• 6 large eggs
• 1 1/2 cups heavy cream
• 1 1/4 cups milk
• 1/4 cup biscuit mix (I always use King Arthur Baking Company mix for a better rise)

Method

 

1. Preheat your oven to 350°F. While it heats, tear the croissants into roughly 1-inch pieces—you want a mix of sizes to create a textured, rustic base rather than uniform cubes. Arrange the pieces evenly in a greased 9x13 inch baking dish or similar size, pressing them down gently so they hold together but still maintain their flaky texture. Spread the sliced almonds on a small baking sheet and toast them in the oven for 5-7 minutes until fragrant and lightly golden, then set aside. This toasting step brings out their nutty flavor and prevents them from becoming soggy in the custard.
2. Melt the butter in a large skillet over medium heat. Add the thinly sliced leeks and cook for 8-10 minutes, stirring occasionally, until they're completely soft and starting to turn golden—this develops their natural sweetness. Mince the garlic cloves and add them to the pan along with the tomato paste, cooking for 1-2 minutes until fragrant and the tomato paste darkens slightly. Stir in the crab, shredded gruyere, seafood seasoning, salt, white pepper, and nutmeg, mixing gently to avoid breaking up the crab meat too much. I like to taste at this point to adjust seasoning—the seafood seasoning should be noticeable but balanced, not overpowering.
3. Spread the warm seafood and leek filling from Step 2 evenly over the croissant base in the baking dish. In a blender, combine the eggs, heavy cream, and milk, blending for about 20 seconds until well combined and smooth. Add the biscuit mix and blend for another 10-15 seconds just until incorporated—don't overmix, as this can develop gluten and make the quiche less tender. Pour this custard mixture slowly and evenly over the filling, making sure it seeps down between the croissant pieces. Scatter the toasted almonds from Step 1 over the top.
4. Place the assembled quiche in the preheated 350°F oven and bake for 30-35 minutes until the custard is set and the top is lightly golden—the center should still have a slight jiggle when you gently shake the pan, as it will continue to set as it cools. Remove from the oven and let it cool for at least 10-15 minutes before slicing; I find this resting time helps the quiche hold together better when served, and it allows the flavors to meld beautifully. Serve warm or at room temperature.