Baked Seafood Casserole
A rich, comforting baked seafood casserole loaded with shrimp, scallops, and white fish in a velvety, herb-infused cream sauce.
- Searing the seafood beforehand releases excess water, preventing a soggy casserole.
- A classic flour-and-butter roux creates a stable starch network that keeps the cream sauce from separating.
- Fresh dill, parsley, and lemon juice cut through the rich dairy for a perfectly balanced flavor profile.
I still remember the damp Tuesday evening I tried to surprise my father with a luxury seafood bake for his sixty-first birthday.
I spent my entire weekly grocery budget on fresh sea scallops and wild-caught shrimp, only to watch them drown in a sad, grey puddle of water at the bottom of my baking dish.
It was a complete disaster.
The science behind this watery tragedy is actually quite simple. Most commercial seafood is treated with sodium tripolyphosphate to retain moisture, which leaks out as the proteins contract. When you bake raw seafood directly in cream, you end up boiling it in its own exuded moisture, which completely breaks your sauce's emulsion.
Trust me on this one: the simple fix is to quickly sear your seafood first. This releases the excess water before it ever touches your baking dish. We then build a velvety sauce using a classic roux, creating a stable starch network that clings to the seafood.
No fancy equipment is needed for this comforting bake. Grab your favorite skillet and a standard baking dish, and let's get cooking.
Baked Seafood Casserole
Ingredients
- 1 lb large shrimp, peeled and deveined
- 1 lb bay scallops, patted dry
- 1 lb 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
- 1.5 cups whole milk
- 1 cup heavy cream
- 1/2 cup grated Parmesan cheese
- 1 tbsp fresh lemon juice
- 2 tbsp chopped fresh parsley
- 1 tbsp chopped fresh dill
- 1 tsp Diamond Crystal kosher salt
- 1/2 tsp freshly cracked black pepper
- 1 cup panko breadcrumbs
Directions
- Preheat your oven to 375°F (190°C) and lightly grease a 9x13-inch baking dish with butter.
- Pat the shrimp, scallops, and fish chunks completely dry with paper towels to ensure a proper sear.
- Melt 1 tablespoon of butter in a large skillet over medium-high heat, then sear the shrimp and scallops for 1 minute per side until just opaque; transfer them to a plate and discard any excess liquid.
- In the same skillet, melt the remaining 3 tablespoons of butter over medium heat, add the minced garlic, and cook for 30 seconds until fragrant.
- Whisk in the flour and cook for 1 minute, stirring constantly, to remove the raw flour taste.
- Slowly pour in the milk and heavy cream, whisking vigorously to prevent lumps, and simmer for 3 minutes until the sauce thickens.
- Stir in the Parmesan cheese, lemon juice, parsley, dill, kosher salt, and black pepper until the cheese is completely melted and smooth.
- Gently fold the seared shrimp, scallops, and raw fish chunks into the cream sauce, then transfer the mixture to your prepared baking dish.
- Evenly sprinkle the panko breadcrumbs over the top and bake for 20 to 25 minutes until the sauce is bubbling and the breadcrumbs are golden brown.
Notes
- I highly recommend using Diamond Crystal kosher salt; if you are using fine sea salt or Morton's kosher salt, cut the volume by half to avoid over-salting.
- Patting the seafood dry is crucial because surface moisture creates steam, preventing a proper sear and lowering the pan temperature, which ruins the protein matrix.
- When making the roux, do not let the garlic or flour burn; keep your whisk moving constantly to prevent bitter, scorched spots in your cream sauce.
- Upon cooling, the starch network in the sauce will tighten significantly in the fridge, making it look solid, but it will loosen beautifully once gently reheated.
- For the best flavor, use fresh dill and parsley rather than dried, as the volatile oils in fresh herbs cut through the heavy cream much more effectively.
Serving Suggestions
Complete this comforting meal by pairing it with simple, rustic sides that complement the rich, creamy seafood flavors.
- This casserole pairs beautifully with warm, crusty bread like our garlic rosemary focaccia to soak up every drop of the cream sauce.
- If you love rich seafood dishes, you might also enjoy our shrimp Tuscan bake or our decadent garlic butter shrimp.
- For a lighter side, serve this alongside simple roasted carrots or a crisp green salad.
- A cold, crisp glass of Sauvignon Blanc or Pinot Grigio cuts through the richness of the cream beautifully.
Storage and Reheating
Seafood is notoriously finicky when it comes to leftovers.
Store any leftover casserole in an airtight glass container in the fridge for up to two days. I do not recommend freezing this dish, as the cream sauce will completely break and turn grainy upon thawing.
To reheat, avoid the microwave at all costs unless you enjoy rubbery shrimp. Instead, place the casserole in a cold oven, set it to 325°F, and let it warm gradually for fifteen minutes.
A splash of milk restores the silkiness.
Ingredient Substitutes
If you need to swap ingredients based on what is available in your pantry, these simple alternatives work beautifully.
- The Fish: If you don't have cod, any firm white fish like halibut, haddock, or even snapper will hold up beautifully in the bake.
- The Cream: You can swap the heavy cream for half-and-half, but avoid skim milk as the sauce will lose its luxurious body and may curdle.
- The Breadcrumbs: Gluten-free panko or crushed butter crackers make an excellent alternative to traditional breadcrumbs for that essential crunchy topping.
I hope this creamy bake brings as much comfort to your table as it finally did to mine once I figured out the watery-sauce mystery. Pour yourself a cold glass of white wine, pull up a chair, and enjoy every single bite.
Susan Rosie
I've spent over 12 years perfecting recipes so you can cook with confidence. Every dish on Storied Skillet is tested multiple times – because your dinner matters. I believe in simple ingredients, clear instructions, and big flavors.
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