Baked Seafood Casserole

A rich, comforting baked seafood casserole loaded with shrimp, scallops, and white fish in a velvety cream sauce, topped with crispy herbed breadcrumbs.

Why This Recipe Works:

• Par-cooking the seafood prevents water release, keeping the cream sauce perfectly emulsified and velvety.
• A starch-gelatinized roux base stabilized with heavy cream prevents curdling under high oven heat.
• The crispy panko-herb topping provides a crucial textural contrast to the tender, rich seafood beneath.

My first attempt at a seafood bake happened in a cramped, third-floor apartment in Boston during a howling February blizzard. I had saved up for a week to buy fresh sea scallops and wild shrimp, determined to impress my partner with a bubbling, golden casserole.

I ended up crying over a watery, grey puddle of rubbery shrimp.

Bear with me here, because the physics of baking delicate seafood in a heavy cream sauce is notoriously unforgiving. When raw shrimp and fish hit a hot oven, their protein matrices contract rapidly, squeezing out water like a wrung-out sponge. If your sauce isn't stabilized correctly, this sudden influx of moisture breaks the emulsion, turning your luxurious cream into a gritty, separated mess.

The simple fix is par-cooking the seafood and building a starch-gelatinized roux base. By lightly searing the shrimp first, you lock in their shape and release excess water before they ever touch the baking dish. We also use a splash of dry white wine to dissolve those oil-soluble flavor compounds, creating a velvety sauce that clings to every bite.

Trust me, this foolproof method delivers restaurant-quality comfort without any fancy equipment, much like our beloved Creamy Baked Feta Pasta.

Baked Seafood Casserole

• Publisher Storied Skillet
• Cuisine American
• Category Dinner, Seafood
• Prep Time 20 mins
• Cook Time 25 mins
• Servings 6
• Calories 420 calories
• Rating 4.8 4277
• Tags baked seafood casserole, shrimp and scallop bake, creamy seafood dinner

Ingredients

• 1 lb (450g) large shrimp, peeled and deveined
• 1 lb (450g) bay scallops, patted dry
• 1 lb (450g) firm white fish (like cod or halibut), cut into 1-inch chunks
• 4 tbsp unsalted butter, divided
• 3 cloves garlic, minced
• 1/4 cup all-purpose flour
• 1/2 cup dry white wine
• 1.5 cups heavy cream
• 1 cup seafood stock
• 1 tsp Diamond Crystal kosher salt
• 1/2 tsp freshly cracked black pepper
• 1 cup panko breadcrumbs
• 1/4 cup freshly grated Parmesan cheese
• 2 tbsp fresh flat-leaf parsley, finely chopped
• 1 tbsp fresh dill, finely chopped

Directions

1. Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish with butter.
2. Melt 1 tablespoon of butter in a large skillet over medium-high heat. Sear the shrimp and scallops for 1 minute per side until just opaque but not fully cooked, then transfer them to a plate using a slotted spoon.
3. In the same skillet, melt another 2 tablespoons of butter over medium heat. Whisk in the flour and cook for 1 minute to eliminate the raw flour taste.
4. Slowly pour in the white wine, whisking constantly until your forearm aches to scrape up any browned bits from the bottom of the pan.
5. Gradually whisk in the seafood stock and heavy cream until smooth, then simmer for 3 to 4 minutes until the sauce thickens enough to coat the back of a spoon.
6. Stir in the kosher salt, black pepper, and minced garlic, then gently fold the par-cooked shrimp, scallops, and raw white fish chunks into the cream sauce.
7. Pour the mixture into the prepared baking dish, then top with a tossed mixture of the remaining 1 tablespoon of melted butter, panko breadcrumbs, Parmesan, parsley, and dill.
8. Bake for 20 to 25 minutes, or until the sauce is bubbling at the edges and the topping is golden brown.

Notes

• Always use Diamond Crystal kosher salt for seasoning; if you only have standard table salt, cut the measurement in half (use 1/2 teaspoon instead of 1 teaspoon) to avoid over-salting the delicate seafood.
• Patting the scallops and shrimp completely dry with paper towels before searing is essential. Excess surface moisture prevents the Maillard reaction, steaming the seafood instead of browning it.
• Keep a close eye on the panko topping during the last 5 minutes of baking. If your oven runs hot, the garlic and herbs in the breadcrumbs can burn quickly; tent with foil if it browns too fast.
• Seafood does not reheat gracefully in the microwave because the intense, uneven heat rubberizes the proteins. Store leftovers in an airtight container for up to 2 days and reheat gently in a 300°F (150°C) oven.
• For an extra layer of flavor, you can swap the seafood stock for clam juice, which provides a clean, briny depth that mimics professional restaurant bakes.

Serving Suggestions

To complete this decadent meal, pair the rich casserole with bright, acidic sides that cut through the heavy cream sauce and refresh your palate.

• Serve alongside a crisp, citrusy salad like our Lemon Arugula Pasta Salad to balance the richness.
• Spoon the bubbling casserole over a bed of buttery linguine or alongside a comforting bowl of Creamy Macaroni and Cheese.
• Accompany with warm, crusty sourdough bread to mop up every last drop of the garlic-infused cream sauce.
• Pair with a glass of chilled, high-acid white wine like Sauvignon Blanc or Pinot Grigio to cleanse the palate between bites.

Storage and Reheating

Let's be completely honest about seafood leftovers.

They are never quite as magical on day two, but you can still enjoy them if you avoid the microwave at all costs. The microwave's aggressive waves will instantly overcook the delicate shrimp and turn your scallops into tiny rubber balls.

Instead, transfer the leftover casserole to an oven-safe dish and cover it tightly with aluminum foil. This traps the steam and prevents the cream sauce from drying out.

Warm it gently in a preheated oven at 300°F (150°C) for about 15 minutes until heated through. If you want to prep this ahead, assemble the seafood and sauce in the baking dish a day early, but keep the panko topping separate until right before baking.

Ingredient Substitutes

If you need to swap ingredients based on what's fresh at your local market, here are the best tested alternatives:

1. White Fish: If cod isn't available, halibut, haddock, or even salmon work beautifully. For a different twist, you can try a Salmon Sushi Bake style approach.
2. Seafood Stock: Chicken bone broth or vegetable stock can be used in a pinch, though seafood stock or clam juice provides the most authentic flavor.
3. White Wine: If you prefer to cook without alcohol, substitute the wine with an equal amount of seafood stock mixed with a squeeze of fresh lemon juice.
4. Panko Breadcrumbs: Regular breadcrumbs or crushed butter crackers make an incredibly buttery alternative topping.

This comforting bake has become my absolute go-to for cozy Sunday dinners when the wind is howling outside. It feels incredibly fancy, yet it comes together with zero fuss in under an hour. Tap your tongs against your hip, pour yourself a glass of that leftover white wine, and enjoy the process of making something truly special.