Seafood Casserole | Creamy, Comforting, and Irresistible

The scent of butter, garlic, and the sea drifting through the kitchen feels like Christmas itself. While snowflakes fall outside, this creamy Seafood Casserole bubbles in the oven, golden and rich. It’s the kind of dish that makes you linger by the stove, spoon in hand, waiting for that first taste of holiday comfort.

Why You’ll Love This Seafood Casserole

This Seafood Casserole brings creamy, restaurant-quality flavor without the fuss. Each bite is rich with scallops, shrimp, crab, and flounder in a velvety Dijon sauce. It feels indulgent, yet it’s simple to make. Also, it’s low-carb and ready in about an hour, making it perfect for cozy dinners or special Christmas celebrations.

Ingredients You’ll Need

Seafood

You’ll need scallops, shrimp, crabmeat, and flounder. Always thaw frozen seafood completely. Dry it well with paper towels before cooking. Dry scallops and lump crab add sweetness and texture that taste fresh from the coast.

Sauce & Seasoning

Butter, heavy cream, Dijon, chicken stock, garlic powder, and Old Bay create the heart of the dish. The sauce cooks quickly and thickens beautifully. You can swap heavy cream for half-and-half with a pinch of cornstarch or use fish stock for more ocean depth.

Equipment

Two 9×5 inch casserole dishes, a sturdy skillet, a whisk, and your oven are all you need.

Step-by-Step Instructions

1. Sauté the Seafood

Melt butter in a skillet. Sear shrimp and scallops for one minute. Then add a splash of white wine to deglaze the pan. Stir in cream, stock, Dijon, and seasonings. Sauté another minute, then set the seafood aside.

2. Make the Creamy Sauce

Add butter mixed with flour to the pan to thicken. Stir gently over low heat until it becomes creamy. Then fold in the shrimp, scallops, and crabmeat until they’re well coated.

3. Bake the Flounder

Preheat oven to 350°F. Place flounder in your casserole dishes, add a little water, sprinkle Old Bay, and bake for 10 minutes. Drain any excess water.

4. Assemble and Bake

Spread the creamy seafood mixture over the flounder. Sprinkle more Old Bay on top. Bake for about 25 minutes until golden and bubbly.

5. Serve and Garnish

Let the casserole rest for five minutes. Garnish with chopped parsley and serve warm. The sauce will thicken slightly as it cools.

Seafood Tips & Substitutions

You can use cod, haddock, or sole instead of flounder. For lighter options, replace cream with half-and-half or swap chicken stock for clam juice. Always choose “dry” scallops—they sear better and bring a deeper flavor. Lump or jumbo crab tastes best, though imitation works if needed.

Common Mistakes to Avoid

Don’t overcook shrimp or scallops. They only need a few minutes. Pat seafood dry to avoid excess water. Keep your heat low to prevent the sauce from breaking. Finally, let your casserole rest before serving—it helps everything come together.

What to Serve With Seafood Casserole

This creamy Seafood Casserole pairs perfectly with white rice, angel hair pasta, roasted broccoli, or a simple green salad. Lighter sides balance the richness of the dish. You can also try my Creamy stuffed seafood bread bowl for dinner parties for an extra festive touch.

Storage & Reheating Tips

Store leftovers in the fridge for up to two days in an airtight container. Avoid freezing, as the seafood can turn rubbery. Reheat in the oven at 325°F for 15–20 minutes, covered. Add a splash of cream if the sauce thickens.

Cooking FAQs

Easy Seafood Casserole Recipe Card

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More Such Recipes

If you love this Seafood Casserole, try these too:

• Smothered okra with shrimp as a Southern seafood side
• Easy and delicious salmon cakes with crisp edges
• Perfect salmon patties and how to keep them from falling apart
• What goes well with salmon patties?
• Baja shrimp tacos for a seafood twist on taco night

Final Thoughts

This creamy, comforting Seafood Casserole feels like a warm hug on a cold night. The golden crust, tender fish, and rich sauce come together in a way that feels special yet simple. Try it this Christmas and let your kitchen smell like the holidays. Don’t forget to share your version or tag me on Pinterest or Facebook.