The BEST Seafood Casserole Made With Shrimp, Scallops, & Crab Meat

This seafood casserole is the ultimate dinner casserole recipe - especially if you love seafood. It combines tender fish fillets with shrimp, scallops, buttery crab meat, and a rich cream sauce to make a hearty and super satisfying dish. Plus, it's so, so easy to make!

The Best Seafood Casserole

If you love seafood, this easy seafood casserole is sure to become your new favorite recipe. It takes all your favorite seafood and pairs them with a rich, decadent cream sauce to create a dish that's to die for.

And, as I just mentioned a second ago, it's super simple to make. In fact, just 4 effortless steps are all you'll need to follow to make it. The recipe basically boils down to doing a little prep work, par-cooking the seafood and making the sauce, and then combining everything together and finishing it off in the oven.

By the way, while the seafood casserole is baking, you'll have time to make a delicious side to go with it, like this hibachi fried rice, these Chinese green beans, or this Southern cornbread.

Why This Recipe Works

Versatile. You can add any seafood that you want to this casserole, and it'll taste delicious!

Crowd-pleaser. Everyone who tries this casserole loves it, especially seafood lovers. So it's ideal for serving if you're hosting, but it also makes a great busy weeknight dinner.

Restaurant-quality. This casserole literally tastes like something that you would get at a high-end restaurant. It's that good.

Ingredients

The ingredients needed to make this recipe are all pretty basic. In fact, besides the seafood, I'm willing to bet you have most- if not all - of the ingredients at home already.

Anyway, here's what you'll need to make this seafood casserole recipe:

• 4 oz. sole fillets (or any fish fillet)
• 7 shrimps, peeled and deveined
• 6 scallops
• 4 oz. crab meat lobster meat
• 4 tbsp unsalted butter
• 2 tbsp flour
• ½ cup heavy cream
• ¾ cup vegetable broth, chicken broth, or seafood broth
• 1 tbsp mustard
• ½ tsp garlic powder
• ½ tsp onion powder
• ½ tsp dried Italian herbs
• *You can use 1 ½ tsps of Old Bay and skip the above herbs/spices

Pretty simple stuff, right?!

By the way, you can use a lot of these same ingredients to make this tuna noodle casserole, shrimp casserole, and salmon casserole. They're three of my other favorite seafood casserole recipes, so you'll definitely want to give those a try next! Or for something a little different, you can use some to make this seafood soup.

How To Make Seafood Casserole

1. Prep: Preheat oven to 350°F (180°C) and melt 2 tbsp of butter in a skillet over medium-high heat.

2. Cook the seafood: Add the shrimp and scallops to the melted butter and cook for 1 minute. Remove the shrimp and scallops from the skillet. Place the fish fillets in a baking dish and season to taste with salt and pepper. Add 2 tbsp of water and cook the fish for 10 minutes.

3. Make the sauce: Add a splash of stock to deglaze the skillet, then add the rest of the broth. Add the heavy cream, mustard, and spices to the skillet. Mix remaining softened butter in a bowl with equal parts of flour (2 tbsps each), then add the butter-flour mixture to the skillet.

4. Complete the sauce: Let the sauce simmer over low heat until it has slightly thickened. Then remove from the heat and stir in cooked shrimp, scallops, and crab meat. Mix to combine everything together and set aside.

5. Assemble the casserole: Drain the excess water from the cooked fish and put the fish in a baking dish. Top the fish with the prepared seafood sauce mixture. 

6. Bake and serve: Bake the casserole for 25 minutes or until golden. Let it cool briefly before serving, and enjoy!

Tips To Make The Best Recipe

• Prepare everything else for the casserole while the fish is baking to save time.
• Add cooked rice to the sauce mixture to make a hearty seafood rice casserole.
• Add veggies like mushrooms, green peppers, celery, or peas to make the casserole healthier.
• Top the casserole with parmesan cheese, swiss cheese, or any shredded cheese before baking to make it a cheesy casserole.
• Sprinkle Italian bread crumbs, panko bread crumbs, or even crushed Ritz crackers mixed with butter on top of the casserole before baking for an added crunch.

How To Store Seafood Casserole

In the fridge: Transfer your extras to an airtight container or put a lid on the casserole dish and store for up to 4 days.

In the freezer: Put the leftover casserole in a freezer-safe container and freeze it for up to 3 months.

Reheating: Put the casserole back in a baking dish and heat at 200°F uncovered for about 15 minutes or until fully reheated. If you need to thin the sauce out a little bit, just add a little broth to the casserole dish. Let the frozen casserole thaw in the fridge before reheating.

FAQS About This Seafood Casserole Recipe

Can I make seafood casserole ahead of time?

Yes! Just assemble the casserole up until baking, cover it with a lid or tightly with plastic wrap, and store in the fridge for up to a day. When you're ready to bake, first let the casserole thaw at room temperature for about 30 minutes, then bake as directed.

What kind of fish can I use to make seafood casserole?

I used sole fish, but any mild white fish like flounder, tilapia, cod, and halibut are all excellent choices.

What kind of crab is best to use in seafood casserole?

Lump crab meat, king crab, snow crab, or canned crab meat will all work well.

More Casserole Recipes

Did this seafood casserole recipe get you in the mood to make even more casseroles? If it did, you're in luck. We have a ton of other really yummy casserole recipes for you to try next!

Here are some of our most popular ones:

• Chicken cordon bleu casserole
• Beef enchilada casserole
• Pulled pork casserole
• Chili cornbread casserole
• French onion chicken casserole
• John Wayne Casserole

Oh, and as always, make sure to check us out on Instagram, TikTok, and YouTube! We post new recipes on them every day.