Easy Seafood Casserole Recipe

A great seafood casserole is about precision, not complexity. When handled with respect, seafood delivers depth, sweetness, and elegance that no heavy seasoning can replace. This easy seafood casserole is crafted with a chef’s mindset—clean flavors, controlled cooking, and a luxurious yet balanced finish—making it ideal for both weeknight dinners and refined gatherings.

Ingredients List

• Fresh white fish fillets (such as cod or haddock), cut into chunks
• Raw shrimp, peeled and deveined
• Sea scallops, halved if large
• Unsalted butter
• Olive oil
• Shallots, finely minced
• Garlic, finely chopped
• All-purpose flour
• Whole milk
• Heavy cream
• Dry white wine
• Dijon mustard
• Fresh lemon zest
• Fresh lemon juice
• Fresh parsley, finely chopped
• Fresh dill or thyme
• Salt
• Freshly ground black pepper
• Breadcrumbs
• Parmesan cheese, finely grated

Step-by-Step Instructions

Prepare the Seafood

Pat all seafood dry with paper towels and season lightly with salt and pepper. Keep refrigerated until ready to assemble to maintain freshness and texture.

Build the Base Sauce

In a saucepan, melt butter with olive oil over medium heat. Add shallots and cook gently until translucent. Stir in garlic and cook briefly until aromatic, avoiding browning.

Create the Cream Sauce

Sprinkle flour into the pan and cook for one minute, stirring constantly. Slowly whisk in milk and cream, followed by white wine. Simmer until smooth and lightly thickened. Add Dijon mustard, lemon zest, herbs, salt, and pepper.

Assemble the Casserole

Lightly butter a baking dish. Arrange seafood evenly, then pour the warm sauce over the top, ensuring even coverage without drowning the seafood.

Add the Topping and Bake

Combine breadcrumbs with Parmesan cheese and a drizzle of olive oil. Sprinkle evenly over the casserole. Bake until bubbling and lightly golden on top, with seafood just cooked through.

Cook Time

Total: 45 minutes
Prep: 20 minutes
Bake: 25 minutes

Servings

Makes approximately 4 servings

Nutritional Information (approx. per serving)

• Calories: 420
• Protein: 34g
• Carbohydrates: 18g
• Fat: 24g

Storage Instructions

Allow the casserole to cool completely before covering. Refrigerate for up to 2 days. Reheat gently in the oven to preserve texture; avoid microwaving, as it can overcook the seafood.

Suggestions

Serve with crusty sourdough or buttered potatoes to absorb the sauce. A crisp green salad or lightly dressed fennel slaw adds freshness and balance to the richness.

Seasonal Relevance

This seafood casserole is best prepared during cooler months when warm, comforting dishes shine, but it remains appropriate year-round when fresh seafood is available.

Conclusion

This easy seafood casserole demonstrates how restraint and technique elevate simple ingredients. Creamy without excess, rich without heaviness, it reflects professional kitchen standards while remaining accessible to home cooks.

FAQs

Can I use frozen seafood for this casserole?
Yes, but ensure it is fully thawed and thoroughly dried before use to prevent excess moisture.

What type of fish works best in a seafood casserole?
Firm white fish such as cod, haddock, or halibut hold their structure well during baking.

Can this casserole be prepared ahead of time?
You can assemble it several hours in advance and refrigerate. Bake just before serving for best texture and flavor.