Picture this: it’s a chilly evening, and the comforting aroma of a creamy seafood casserole fills your kitchen. This dish, a timeless classic, blends the briny sweetness of the sea with the richness of a velvety sauce and the delicate texture of flounder, shrimp, scallops, and crab. It’s the kind of recipe that transforms an ordinary dinner into something truly memorable, whether it’s a cozy family night or a special occasion with friends.

Seafood casseroles have a long history of gracing tables, often reserved for festive celebrations or indulgent weekend meals. The beauty of this recipe lies in its simplicity. Despite its luxurious flavors and elegant presentation, it’s surprisingly easy to make. No need for advanced cooking techniques or expensive ingredients—just a little love, some fresh seafood, and a touch of seasoning.

This casserole is not only a feast for the palate but also a low-carb, protein-packed option for those looking to enjoy guilt-free indulgence. Let’s dive into the recipe and create a dish that feels like a warm hug from the sea.

Why You’ll Love This Recipe

• Perfect for special occasions – Whether it’s a romantic dinner, holiday gathering, or just a treat-yourself night, this dish feels fancy yet approachable.
• Low-carb and keto-friendly – If you’re avoiding carbs but craving something hearty, this casserole is an excellent choice.
• Versatile and customizable – Swap in your favorite seafood or adjust the seasonings to suit your taste. It’s a recipe that welcomes personalization.
• Quick to prepare – You can go from prep to table in just about an hour, making it an achievable option for weeknights.
• Comfort in every bite – The rich, creamy sauce pairs perfectly with the tender seafood, creating a dish that feels like pure decadence.

Ingredients You’ll Need

• 4 ounces flounder fillets
• 6 extra-large shrimp, peeled and deveined
• 6 large scallops
• 4 ounces lump crabmeat
• 4 tablespoons butter
• 1/2 cup heavy cream
• 3/4 cup chicken stock
• 1 tablespoon Dijon mustard
• 1/2 teaspoon garlic powder
• 1/2 teaspoon onion powder
• 1/4 teaspoon black pepper
• 1/2 teaspoon Old Bay seasoning (optional)
• 1/2 teaspoon chopped Italian parsley (optional)

How to Make Seafood Casserole

Step 1: Prepare the Seafood

Start by patting all your seafood dry with paper towels. This is a small but crucial step to ensure your casserole doesn’t end up watery. Heat a large skillet over medium-high heat and melt 2 tablespoons of butter. Once it’s hot, add the shrimp and scallops. Cook them for about one minute on each side, just long enough to get a golden sear while keeping the insides tender. Remove the shrimp and scallops and set them aside.

Step 2: Build the Creamy Sauce

In the same skillet, add the heavy cream, chicken stock, Dijon mustard, garlic powder, onion powder, and black pepper. Stir everything together, scraping up any browned bits from the bottom of the pan. Let the sauce simmer gently, reducing slightly to concentrate the flavors. To thicken, add two tablespoons of butter dredged in flour (a French trick known as beurre manié). Stir continuously until the sauce achieves a silky consistency. Add the crabmeat, seared scallops, and shrimp back to the skillet, tossing to coat them evenly in the sauce. Remove from heat and set aside.

Step 3: Bake the Flounder

Preheat your oven to 350°F (175°C). Lightly grease a casserole dish and lay the flounder fillets at the bottom. Add a splash of water to the dish and sprinkle the fish with Old Bay seasoning for an extra layer of flavor. Bake the flounder for 10 minutes. This step ensures the fish cooks evenly and won’t be overwhelmed by the sauce later.

Step 4: Assemble the Casserole

Once the flounder is partially cooked, drain any excess liquid from the dish. Spoon the seafood mixture over the flounder fillets, spreading it out evenly. If you love a slightly golden crust, sprinkle the top with a touch more Old Bay seasoning.

Step 5: Bake and Serve

Return the dish to the oven and bake for an additional 25 minutes. The casserole should be bubbling and lightly golden on top when it’s ready. Let it cool for a few minutes before serving. Garnish with chopped parsley for a fresh, vibrant finish.

Helpful Tips

• Fresh vs. frozen seafood: Fresh seafood works best for this recipe, but if you’re using frozen, ensure it’s fully thawed and patted dry to avoid a watery casserole.
• Flavor boost: If you enjoy a slightly smoky note, add a pinch of smoked paprika to the sauce.
• Make it ahead: You can prepare the seafood mixture and bake the flounder in advance. Assemble the casserole when you’re ready and bake it for the final 25 minutes.

Recipe Details

• Prep Time: 15-25 minutes
• Cook Time: 35-45 minutes
• Total Time: 50-70 minutes
• Yield: 4-6 servings
• Category: Main Course
• Method: Baking
• Cuisine: American
• Diet: Low-Carb

Notes:

• Fresh vs. Frozen: Use fresh seafood for the best flavor, but frozen works if properly thawed and dried.
• Fish Options: Swap flounder with cod, haddock, or tilapia if needed.
• Seasoning Tip: Old Bay adds great flavor but can be replaced with paprika, celery salt, and pepper.
• Brighten It Up: Add a splash of lemon juice or a pinch of cayenne for extra zest.
• Crispy Topping: For crunch, sprinkle Parmesan or a low-carb breadcrumb substitute before baking.
• Garnish Ideas: Top with parsley, dill, or chives for freshness and color.

Nutritional Information (Per Serving, Based on 6 Servings)

• Calories: 320
• Protein: 25g
• Fat: 22g
• Carbohydrates: 4g

Frequently Asked Questions

Can I use other types of fish?
Absolutely! Cod, haddock, or tilapia can be excellent substitutes for flounder. Just ensure the fillets are of similar thickness for even cooking.

What can I serve with this casserole?
Pair it with a crisp green salad, roasted vegetables, or cauliflower rice for a complete meal.

How can I store leftovers?
Refrigerate any leftovers in an airtight container for up to 3 days. Reheat gently in the oven or microwave to maintain the creamy texture.

Storage Instructions

To store leftovers, transfer the cooled casserole to an airtight container and refrigerate for up to 3 days. Reheat in a preheated oven at 300°F (150°C) until warmed through. Avoid reheating at high temperatures, as this can cause the seafood to become rubbery.

Related Recipes

If you loved this seafood casserole, here are a few other dishes to try:

• Famous Red Lobster Shrimp Scampi: A Timeless Classic to Make at Home
• Garlic Shrimp Gratin: An Indulgent, Flavorful Classic

Conclusion

This seafood casserole is more than a meal—it’s an experience. The perfect blend of ocean-fresh flavors and indulgent creaminess will transport you to a cozy seaside bistro. Whether you’re new to cooking or a seasoned chef, this recipe is simple, approachable, and oh-so-rewarding. Gather your ingredients, invite a few loved ones, and savor the joy of a homemade, comforting seafood feast.

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