As I pulled the seafood gratin from the oven, the air filled with a rich, intoxicating aroma that set everyone’s stomachs rumbling. This Creamy Seafood Gratin effortlessly combines comfort with a touch of elegance, making it a perfect dish for cozy evenings or special celebrations. With a crispy topping that contrasts with the creamy, decadent sauce beneath, you can delight your guests (or yourself!) with every spoonful. Plus, this dish is remarkably versatile; you can mix and match various seafood to fit your cravings or pantry inventory. Whether it’s shrimp, scallops, or a hint of lobster to elevate the experience, the possibilities are endless. And the best part? It’s quick to prepare, allowing you more time to savor those precious moments with loved ones. What seafood treasure will you add to your gratin today?

Why is this Seafood Gratin irresistible?
Comforting, creamy goodness: Each spoonful offers a rich and satisfying texture that warms the soul.
Endless customization: Use any combination of seafood like shrimp and scallops or even crab for special occasions.
Quick prep: You can whip this dish up in under an hour, perfect for busy weeknights or last-minute gatherings.
Crowd-pleaser: Impress your family or guests with a dish that exudes elegance while being incredibly inviting.
Gourmet-feel: With that crispy topping against the creamy interior, you’ll feel like a five-star chef without leaving your kitchen! Consider pairing it with a fresh green salad and crusty bread to soak up the decadent sauce.
Seafood Gratin Ingredients
• Get ready to create a creamy delight!
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For the Seafood Base
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Mixed Seafood – 1 pound; brings rich flavor and texture; substitute with shrimp, scallops, or mussels for variety.
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For the Flavor Base
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Dry White Wine – 1/2 cup; adds acidity and depth; replace with seafood stock for a non-alcoholic version.
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Olive Oil – 1/4 cup; perfect for sautéing; can substitute with butter for a different richness.
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Onion – 1 small, finely chopped; adds aroma and sweetness; shallots can provide a milder touch.
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Garlic – 2 cloves, minced; enhances flavor; adjust based on your taste preference.
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For the Béchamel Sauce
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All-purpose Flour – 1/4 cup; essential for creating a roux; gluten-free flour can easily replace it.
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Milk – 2 cups; gives creaminess to the sauce; use plant-based milk for a dairy-free option.
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Heavy Cream – 1/4 cup; for that luxurious richness; substitute with half-and-half for a lighter touch.
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Nutmeg – Pinch; adds warmth and complexity; feel free to omit if not preferred.
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For Seasoning & Finishing Touches
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Parmesan Cheese – 1/4 cup (plus more for topping); lends a delightful umami flavor; nutritional yeast can be used for a vegan alternative.
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Gruyere Cheese – 1/4 cup (plus more for topping); offers savory depth; Swiss cheese can be a great substitute.
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Butter – 2 tablespoons; adds flavor and helps form the roux; olive oil can work as a dairy-free alternative.
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Breadcrumbs – 1/4 cup; ensures a crispy topping; opt for panko for extra crunch.
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Chopped Fresh Parsley – 1 tablespoon; gives a fresh burst of flavor; you can substitute with chives or thyme.
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Lemon Zest – 1 teaspoon; brightens up the rich flavors beautifully.
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Salt and Black Pepper – to taste; essential for proper seasoning.
With these Seafood Gratin ingredients at your disposal, you’re just a few steps away from creating an unforgettable dish that will warm hearts and bellies alike!
Step‑by‑Step Instructions for Seafood Gratin
Step 1: Prepare the Seafood
Thaw and dry 1 pound of mixed seafood thoroughly, ensuring no excess moisture remains. As you dry it, chop the seafood into bite-sized pieces for even cooking later. This step is crucial for the perfect texture in your Seafood Gratin, so take your time ensuring all pieces are ready.
Step 2: Sauté the Aromatics
In a large skillet, heat 1/4 cup of olive oil over medium heat. Add the finely chopped onion and sauté for about 5-7 minutes, stirring frequently until they turn translucent and fragrant. This will create a lovely aromatic base for your Seafood Gratin, setting the tone for the rich flavors to come.
Step 3: Add Garlic and Wine
Stir in 2 minced garlic cloves and cook for an additional minute until golden and fragrant. Then pour in 1/2 cup of dry white wine, bringing it to a gentle simmer. Allow this mixture to reduce for 2-3 minutes, enhancing the depth of flavor in your Seafood Gratin while deglazing the pan.
Step 4: Incorporate the Seafood
Carefully add the prepared seafood to the skillet, cooking for about 5-7 minutes until just cooked through. Keep an eye on the seafood, discarding any unopened shells for safety. This step infuses the dish with delicious seafood flavors that will shine through in your gratin.
Step 5: Season and Set Aside
Once the seafood is cooked, season the mixture with salt and black pepper to taste, then remove it from the heat. Set this flavorful seafood blend aside while you prepare the rich béchamel sauce that will bind everything together beautifully in the Seafood Gratin.
Step 6: Make the Béchamel Sauce
In a separate saucepan, melt 2 tablespoons of butter over medium heat. Whisk in 1/4 cup of all-purpose flour to form a roux, cooking for about 1 minute until golden. Gradually whisk in 2 cups of milk, stirring until the mixture thickens and bubbles, which should take about 5 minutes.
Step 7: Creamy Finish
Once thickened, stir in 1/4 cup of heavy cream along with 1/4 cup each of Parmesan and Gruyere cheeses until smooth. Season with a pinch of nutmeg, salt, and pepper to taste, ensuring a rich, creamy béchamel sauce that perfectly complements the Seafood Gratin.
Step 8: Combine and Add Zest
Gently fold the seafood mixture into the béchamel sauce, incorporating well. Add in 1 teaspoon of lemon zest and 1 tablespoon of chopped fresh parsley for a burst of brightness. This final combination is what transforms the ingredients into a heavenly filling for your Seafood Gratin.
Step 9: Prepare for Baking
Preheat your oven to 375°F (190°C) and grease a baking dish to prevent sticking. Pour the delicious seafood mixture into the dish, spreading it evenly. This step is crucial for ensuring every spoonful of your Seafood Gratin is packed with flavor.
Step 10: Create the Topping
Sprinkle 1/4 cup of breadcrumbs and extra grated cheeses on top of the seafood mixture. This creates that crunchy, golden-brown topping that contrasts beautifully with the creamy layer beneath. A little extra cheese never hurts, adding to the richness of your Seafood Gratin.
Step 11: Bake to Perfection
Place the baking dish in the oven and bake for 20-25 minutes, or until the top is bubbling and golden brown. Keep an eye on it, as you want a delightful crust to form, which enhances both the visual appeal and flavor of your Seafood Gratin.
Step 12: Rest and Serve
Once baked, remove the Seafood Gratin from the oven and let it rest for a few moments before serving. This wait allows the filling to settle and makes for easier scooping. Dive into this comforting dish, and savor each creamy, cheesy bite with crunchy topping.

Expert Tips for Seafood Gratin
• Fresh Seafood Needed: Always use the freshest seafood possible for rich flavor; frozen seafood should be completely thawed and dried to prevent excess moisture.
• Avoid Overcooking: Be careful not to overcook the seafood in the skillet, as it will continue to cook in the oven. This ensures a tender texture for your Seafood Gratin.
• Wine for Depth: A splash of dry white wine in your béchamel sauce enriches the overall flavor; feel free to replace it with seafood stock if preferred.
• Perfectly Crispy Topping: For an extra crunchy layer, consider using panko breadcrumbs, enhancing the contrast with the creamy filling of your gratin.
• Make Ahead Option: Prepare this Seafood Gratin in advance, refrigerate, then just add extra baking time to serve a warm, delightful dish later!
Make Ahead Options
These Seafood Gratin are perfect for meal prep enthusiasts! You can prepare the seafood mixture and béchamel sauce up to 24 hours in advance. Simply follow steps 1 through 6, then let the mixture cool before transferring it to an airtight container and refrigerating. For optimal flavor, store the seafood mixture and sauce separately. When you’re ready to bake, simply combine the seafood and béchamel, pour into your greased baking dish, top with breadcrumbs and cheese, and bake at 375°F (190°C) for 25-30 minutes. This way, you’ll enjoy the same creamy, decadent flavors with minimal effort on busy weeknights!
How to Store and Freeze Seafood Gratin
Fridge: Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. This keeps your Seafood Gratin fresh without sacrificing too much flavor.
Freezer: For longer storage, freeze individual portions in freezer-safe containers for up to 2 months. Make sure to wrap each portion tightly to prevent freezer burn.
Reheating: When ready to enjoy again, thaw overnight in the fridge and reheat in the oven at 350°F (175°C) until warmed through and the topping is crispy.
What to Serve with Creamy Seafood Gratin
Transform your seafood gratin into a full dining experience with these delightful pairings that enhance every bite.
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Simple Green Salad: Light and refreshing, this salad adds a crisp contrast to the rich gratin, providing balance and brightness with each forkful.
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Crusty Artisan Bread: Perfect for soaking up the creamy sauce, the chewy, rustic texture of crusty bread invites everyone to indulge even more.
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Roasted Asparagus: Tender, caramelized asparagus adds earthy flavors and a delightful crunch, pairing beautifully with the creamy richness of the seafood.
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Garlic Mashed Potatoes: Creamy and buttery, these decadent mashed potatoes complement the seafood gratin and create an irresistible comfort food experience.
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White Wine: A chilled glass of crisp, dry white wine elevates the dish, matching the flavors of the seafood while providing a refreshing contrast.
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Lemon Butter Sauce: Drizzling a bit of tangy lemon butter over the gratin brightens the dish, enhancing the flavors while adding a luxurious touch with every bite.
Seafood Gratin: Twist it Up!
Feel free to switch things up with these creative modifications to truly make this dish your own!
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Seafood Variety: Explore using crab, lobster, or smoked salmon as your main seafood for a gourmet twist. Each option can completely transform the flavor profile.
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Veggie Boost: Try incorporating spinach, artichoke hearts, or sautéed mushrooms to add both nutrition and flavor. This twist not only enhances the dish but also adds a colorful presentation.
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Heat Kick: Add a pinch of red pepper flakes to the béchamel sauce for a delightful kick. If heat isn’t your thing, you can completely omit this for a milder flavor.
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Cheese Changes: Experiment with different types of cheese like feta or pepper jack instead of Gruyere for a unique twist. The choice of cheese can elevate the creaminess and flavor complexity.
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Gluten-Free Adaptation: Replace all-purpose flour with a gluten-free blend to accommodate dietary needs without compromising on flavor. You’ll still achieve that dreamy béchamel texture!
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Make Ahead: Assemble your gratin in advance and refrigerate before baking. It’s a great meal prep option; just add a few extra minutes to the baking time when you’re ready to enjoy.
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Toppings Delight: Swap traditional breadcrumbs for crispy panko or even crushed crackers for extra crunch! Both options bring an appealing texture that complements the creamy seafood filling.
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Herb Infusion: Replace parsley with fresh dill or tarragon for a more fragrant dish that brightens the overall flavor profile. It’s a lovely way to personalize this comforting classic.
Don’t forget, for a sidekick, a fresh green salad and crusty bread pair beautifully with this comforting seafood delight. The charm of a dish lies in its ability to make you feel at home—find the variations that resonate with you!

Creamy Seafood Gratin Recipe FAQs
What is the best seafood for a Seafood Gratin?
Absolutely! You can use a variety of mixed seafood including shrimp, scallops, mussels, calamari, and even lobster for enhanced richness. The combination you choose can create unique flavors, so feel free to experiment based on availability or personal preference!
How do I store leftovers of Seafood Gratin?
Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Make sure to let it cool completely before sealing to preserve its creamy texture and flavorful qualities. When you reheat, I recommend using the oven to recapture that delightful crispy topping.
Can Seafood Gratin be frozen?
Yes! For freezing, place individual portions in freezer-safe containers. Be sure to wrap each portion tightly to prevent freezer burn. It can be stored for up to 2 months. When you’re ready to enjoy, simply thaw overnight in the refrigerator and reheat in the oven at 350°F (175°C) until it’s warmed through and the topping is nice and crispy.
What if my Seafood Gratin is too watery?
If you find your Seafood Gratin turns out watery, it could be due to excess moisture in the seafood. To prevent this, ensure they are thoroughly dried and avoid overcooking during the initial sauté. If it’s already too watery, you can try adding a bit more breadcrumb topping and baking it a little longer to absorb some of that moisture.
Is Seafood Gratin safe for people with seafood allergies?
Definitely not! This dish contains a variety of seafood that can trigger allergies. Always inform your guests before serving, and consider preparing an alternative dish without seafood if you’re hosting someone with seafood allergies.
Can I make Seafood Gratin ahead of time?
Certainly! This dish is perfect for meal prep. Prepare the gratin up to the baking step, cover it with foil or plastic wrap, and refrigerate. When you’re ready to serve, simply increase the baking time by about 10-15 minutes to ensure it’s heated throughout. Enjoy the convenience without sacrificing flavor or freshness!

Creamy Seafood Gratin: A Comforting Dish You’ll Love
Ingredients
Equipment
Method
- Thaw and dry the mixed seafood thoroughly, ensuring no excess moisture remains. Chop the seafood into bite-sized pieces for even cooking.
- Heat olive oil over medium heat. Add chopped onion and sauté for about 5-7 minutes, until translucent and fragrant.
- Add minced garlic and cook for an additional minute. Then pour in dry white wine and simmer for 2-3 minutes, reducing the mixture.
- Carefully add the prepared seafood, cooking for about 5-7 minutes until just cooked through.
- Season the seafood mixture with salt and black pepper to taste, then remove from heat and set aside.
- In a separate saucepan, melt butter. Whisk in flour to form a roux, cooking for about 1 minute. Gradually whisk in milk, stirring until thickened.
- Stir in heavy cream, Parmesan, and Gruyere cheeses until smooth. Season with a pinch of nutmeg, salt, and pepper to taste.
- Fold the seafood mixture into the béchamel sauce, incorporating well. Add lemon zest and parsley.
- Preheat your oven to 375°F (190°C) and grease a baking dish. Pour the seafood mixture into the dish, spreading it evenly.
- Sprinkle breadcrumbs and extra grated cheeses on top of the seafood mixture.
- Bake for 20-25 minutes, until the top is bubbling and golden brown.
- Remove from oven and let it rest briefly before serving.

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