This Seafood Gratin Pasta Bake is the ultimate comfort food. Tender pasta and mixed seafood are baked in a silky, creamy white sauce and finished with a golden crunchy topping of breadcrumbs and parmesan cheese.
The best part?
This dish is incredibly creamy without using any cream at all.
Instead, it uses a classic French béchamel sauce, which creates a rich and velvety texture using butter, flour, and milk.
It’s easy to make, packed with flavor, and perfect for a cozy dinner at home.
❤️ Why You’ll Love This Recipe
✔ Ultra creamy without heavy cream
✔ Simple ingredients and easy preparation
✔ Perfect for weeknight dinners
✔ Golden crunchy topping with parmesan
✔ Comforting and satisfying
This dish tastes like something from a French bistro, yet it’s simple enough to make at home.
🧈 The Secret: Béchamel Sauce
The creamy texture of this seafood gratin comes from béchamel sauce, one of the classic French “mother sauces.”
It’s made with just three basic ingredients:
- butter
- flour
- milk
The butter and flour form a roux, which thickens the milk into a smooth, creamy white sauce.
Béchamel is also the base for many famous sauces such as:
- Mornay sauce
- cheese sauce
- mustard cream sauce
It may sound fancy, but it’s actually very easy to make.
🦐 Ingredients
For the Pasta Bake
- 7 oz (200 g) macaroni or any pasta
- 1½ tbsp olive oil
- 1 lb (500 g) mixed seafood (marinara mix: shrimp, fish, mussels, calamari)
- 2 leeks, thinly sliced
- 2 garlic cloves, minced
For the White Sauce
- 3 tbsp butter
- 3 tbsp flour
- 2½ cups milk
- 1 chicken bouillon cube (or 1½ tsp stock powder)
Optional alternative:
Replace the bouillon with ½ cup grated parmesan cheese.
For the Crispy Topping
- ¾ cup panko breadcrumbs
- ¼ cup grated parmesan cheese
- fresh chopped parsley (optional)
👩🍳 How to Make Creamy Seafood Pasta Bake
1. Preheat the Oven
Preheat your oven to 350°F (180°C).
2. Cook the Pasta
Cook the pasta according to package instructions.
Drain and transfer it to a baking dish.
3. Sear the Seafood
Heat 1 tablespoon olive oil in a skillet over very high heat.
Add the seafood and sear for about 30 seconds per side.
The seafood should still be slightly raw inside.
Transfer it to the baking dish with the pasta.
4. Cook the Leeks and Garlic
In the same skillet, add the remaining oil.
Cook the leeks and garlic for about 3 minutes, until soft.
Add them to the baking dish.
5. Combine the Pasta Mixture
Mix together in the baking dish:
- pasta
- seafood
- leeks
6. Make the Béchamel Sauce
In the same skillet:
- Melt the butter.
- Add the flour and mix to form a roux.
- Cook for 1 minute.
Add:
- 1 cup milk while whisking
- then the remaining milk
- the bouillon cube (crumbled)
Cook for about 5 minutes, whisking until the sauce thickens and coats the back of a spoon.
Season with salt and pepper.
7. Assemble the Gratin
Pour the sauce over the pasta mixture.
Sprinkle the top with:
- panko breadcrumbs
- parmesan cheese
8. Bake
Bake for 20–25 minutes, until the top is golden and crispy.
Let the dish rest 5 minutes before serving.
Garnish with fresh parsley if desired.
🍽 Serving Suggestions
This seafood pasta bake pairs beautifully with:
- garlic sautéed spinach
- simple green salad
- crusty bread
👨🍳 Upgrade for Restaurant Quality
In traditional seafood gratins, chefs often use homemade seafood broth.
To upgrade this recipe:
- replace part of the milk with homemade seafood stock
- add a splash of cream
This adds even deeper seafood flavor.
❄️ The Ultimate Comfort Food
Gratins are one of the best comfort foods during colder months.
Along with:
- creamy soups
- hearty stews
- baked casseroles
A bubbling, golden gratin straight from the oven is pure comfort on a plate.