Easy Seafood Casserole Recipe with Shrimp, Scallops & Haddock

This creamy, cheesy Seafood Casserole is comfort food at its best—simple to make, packed with ocean flavor, and perfect for cozy family dinners. I love this dish because it’s everything you want in a weeknight meal: quick, nourishing, and always a hit with both adults and kids.

If you’re like me and juggling busy evenings with hungry mouths, this recipe saves the day. It comes together in one dish, bakes beautifully, and feels like something you’d order at a seafood restaurant—without the price tag. Whether you’re craving a fish casserole, crab and shrimp seafood bisque, or just something warm and bubbly, this casserole will hit the spot.

Why This Seafood Casserole Belongs on Your Dinner Table

Let me tell you—I’ve made this Seafood Casserole more times than I can count. It’s one of those no-fail, always-gets-praised dishes. My kids call it “seafood mac and cheese without the noodles.” My husband? He’s all about the scallops and creamy sauce. And me? I love that it takes less than 30 minutes from start to finish.

Here’s why you’ll love it too:

• Family-friendly and mild enough for picky eaters
• One-pan meal with minimal cleanup
• Easily adapted to what seafood you have on hand
• Feels fancy, but it’s totally fuss-free

Ingredients You’ll Need for This Seafood Casserole

Base Ingredients

• 8 oz haddock, cleaned and skinned (or substitute cod)
• 1 lb scallops, preferably dry-packed
• 1 lb large shrimp, cleaned and deveined
• 3–4 garlic cloves, minced

Creamy Topping

• 1/2 cup heavy cream (add up to 3/4 cup for extra creaminess)
• 1/2 cup shredded Swiss cheese (or mozzarella)
• 2 tbsp grated Parmesan cheese

Seasoning

• Paprika, for color and subtle spice
• Sea salt and black pepper, to taste

How to Make Seafood Casserole Step-by-Step

Step 1: Preheat & Prep

• Preheat oven to 375°F.
• Spray a 7×11 baking dish with nonstick spray (glass or ceramic works best).

For Step 2: Build Your Layers

1. Cut haddock into 1.5-inch chunks and spread evenly in the dish.
2. Add scallops and shrimp.
3. Sprinkle with salt, pepper, and minced garlic.

Step 3: Add Cream and Cheese

4. Pour heavy cream over the seafood.
5. Sprinkle shredded Swiss cheese.
6. Finish with paprika and a generous topping of grated Parmesan.

Step 4: Bake It!

• Bake uncovered for 15–20 minutes.
• Check at 15—seafood should be just cooked through.
• Don’t overbake or the shrimp will toughen.

My Best Tips for Perfect Seafood Casserole

• Dry your seafood. Wet scallops or shrimp can make the casserole watery.
• Use fresh garlic. It brings so much flavor!
• Add a squeeze of lemon just before serving for brightness.
• Feeling indulgent? Add a spoonful of cream cheese to the mix before baking.

A Little Story

The first time I made this, it was a total weeknight experiment. I had some frozen scallops and shrimp, a block of Swiss cheese, and zero dinner plans. It came together so fast and turned out creamy and rich—my family asked for it again the next night. That’s when I knew I had a winner.

Seafood Casserole FAQs

How to thicken seafood casserole?

Stir 1 tablespoon of flour into the cream or use a small dollop of cream cheese.

Can I freeze this casserole?

Yes—freeze before baking. Thaw overnight before popping it in the oven.

Why is my casserole watery?

Seafood can release water—pat it dry well before assembling.

What’s a good side dish for this?

• Buttery garlic bread
• Steamed broccoli or asparagus
• Simple salad with citrus vinaigrette

Do I need to cover it while baking?

Nope! You want the top golden and the cheese bubbly.

Can I add other seafood?

Absolutely! Crab, lobster, or even chunks of salmon work great.

Seafood Casserole Pairings & Substitutions

This dish goes great with:

• Crisp white wine like Pinot Grigio
• A side of lemony couscous
• Roasted carrots or Brussels sprouts

Or swap the Swiss for Gruyère for a nuttier flavor. Want a twist? Add cooked rice to the bottom for a heartier bake.

More Seafood Recipes You’ll Love

• Try other creamy, baked seafood dishes like our creamy shrimp gratin bake
• Want a flavor bomb? Check out this authentic New Orleans-style gumbo
• For something fun and fresh, you’ll love our lobster BLTs

Save This Recipe for Later

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Let’s Chat!

Made this Seafood Casserole? Drop a comment below—I’d love to hear how it turned out! Don’t forget to tag me if you post it. And if you have a fun twist on this recipe, please share!

Final Thoughts

This Seafood Casserole is more than a recipe—it’s a family staple. It’s my go-to when I want something cozy, comforting, and packed with rich seafood flavor. Try it once and you’ll see why it’s always in my rotation.

Give it a go, and tell me how it turned out. I’m all ears (and forks)!

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