Seafood Lasagna with White Sauce Recipe

It’s Wednesday. You’re staring into the fridge. The family wants something special, but you have zero energy for a culinary project. Sound familiar?

I hear you. That’s why we’re making Seafood Lasagna with White Sauce tonight. It sounds fancy. It tastes incredible. But I promise you, it’s a total weeknight warrior. If you love creamy, seafood-forward pasta dishes, you might also enjoy our White Garlic Sauce Shrimp Lasagna Soup for another quick and comforting meal.

This is not a fussy, all-day affair. We’re using smart shortcuts and big-flavor ingredients. Think creamy comfort, sweet shrimp, and tender crab, all baked into the coziest pasta dish. You get all the “wow” with a fraction of the work.

Recipe Overview

• Cuisine: Italian-Inspired
• Category: Baked Dinner
• Prep Time: 20 minutes
• Cook Time: 45 minutes
• Total Time: 1 hour 5 minutes
• Servings: 6-8

Ultimate Guide to Seafood Lasagna with White Sauce

Forget complicated guides. This is the only one you need. Why? Because we focus on flavor, not fuss.

Most seafood lasagna recipes are heavy. They take forever. Ours uses a simple bechamel sauce as the base. It’s light, creamy, and lets the seafood shine. For a classic, cheesy white sauce variation, our Creamy White Cheddar Lasagna Soup is another fantastic option.

We skip pre-cooking the lasagna noodles. That’s right—no boiling pot needed. The noodles cook perfectly in the saucy, steamy oven. This trick saves you at least 15 minutes and a pile of dishes.

The result is a luxurious, baked dinner that feels like a celebration. But it’s built for a regular Tuesday. Maximum reward for your effort. That’s the goal.

The Simple Ingredients

Gathering everything is the hardest part. After this, it’s smooth sailing. Most of this is pantry or freezer staples.

• 12 no-boil lasagna noodles
• 4 tbsp butter
• 1/3 cup all-purpose flour
• 4 cups whole milk, warmed
• 1/2 tsp ground nutmeg
• Salt and black pepper
• 1 lb cooked medium shrimp, tails removed
• 8 oz lump crab meat (fresh, canned, or frozen/thawed)
• 3 cups shredded mozzarella cheese, divided
• 1 cup grated Parmesan cheese, divided
• 1 tbsp lemon juice
• 2 tbsp fresh parsley, chopped

Let’s Get Cooking! (The Step-by-Step)

Ready? Let’s move fast. Preheat your oven to 375°F (190°C). Grab a 9×13 inch baking dish. No need to grease it.

1. Make the bechamel sauce. Melt the butter in a large pot over medium heat. Whisk in the flour. Cook for 1 minute until it smells a bit nutty.
2. Slowly pour in the warm milk, whisking constantly. Keep whisking until the sauce thickens and bubbles. This takes about 5-7 minutes.
3. Remove the pot from the heat. Stir in the nutmeg, 1 cup of the mozzarella, and 1/2 cup of the Parmesan. Season well with salt and pepper. Your base is done!
4. Mix your seafood. In a bowl, combine the shrimp, crab meat, lemon juice, and parsley. Gently fold in about 1 cup of your white sauce. This coats everything in flavor.
5. Build the lasagna. Spread 1/2 cup of plain white sauce on the bottom of your baking dish. Layer 4 lasagna noodles on top.
6. Add half of the seafood mixture. Spoon about 1 cup of white sauce over it. Sprinkle with 1 cup of mozzarella.
7. Repeat: Noodles, remaining seafood, 1 cup sauce, 1 cup mozzarella. Top with a final layer of noodles.
8. Pour the remaining white sauce over the top layer. Make sure it’s covered. Sprinkle with the last 1/2 cup of Parmesan.
9. Cover the dish tightly with foil. Bake for 35 minutes.
10. Remove the foil. Bake for another 10-15 minutes until the top is golden and bubbly. Let it sit for 10 minutes before slicing. This step is non-negotiable for clean cuts.

What to Serve With This Dish

This lasagna is rich. You need something bright and fresh on the side. Keep it easy.

A simple bagged Caesar salad is perfect. Just dump it in a bowl. Done.

Garlic bread is always a win. Use frozen garlic toast or a store-bought baguette. Pop it in the oven during the last 10 minutes of baking.

Steamed green beans or broccoli also work. A squeeze of lemon on top cuts the richness beautifully.

Make This Recipe Your Own (Quick Swaps)

Don’t stress if you’re missing an ingredient. Cooking should be flexible. Here are my favorite easy swaps.

Use all shrimp or all crab. Or try chopped scallops. Frozen mixed seafood from the store works great too. Just thaw it first.

Swap mozzarella for fontina or a mild provolone. They melt like a dream. For a sharper kick, use Gruyère in the sauce.

Add a layer of fresh spinach. Just toss a few handfuls between the seafood layers. It wilts down perfectly in the oven.

How to Store Leftovers (If You Have Any!)

This reheats like a dream. Let the baked dinner cool completely.

Store it in an airtight container in the fridge for up to 3 days. Reheat individual portions in the microwave.

For a larger piece, use the oven at 350°F until warm. This keeps the noodles from getting soggy. You can also freeze the whole pan for up to 2 months.

NUTRITION INFORMATION

• Calories: ~520
• Carbohydrates: 38g
• Protein: 38g
• Fat: 24g
• Saturated Fat: 14g
• Cholesterol: 195mg
• Sodium: 980mg
• Fiber: 2g
• Sugar: 9g

*Nutrition is an estimate per serving.

FREQUENTLY ASKED QUESTIONS

Can I use regular lasagna noodles?

Yes! Just boil them first according to the package directions. Pat them dry with paper towels before layering. The no-boil kind just saves you a step.

My sauce seems too thick. What do I do?

No problem! Just whisk in a little more warm milk, a splash at a time, until it’s a creamy, pourable consistency. It will thicken more in the oven.

Can I make this ahead of time?

Absolutely. Assemble the whole dish, cover it, and refrigerate for up to 24 hours. Add 10-15 minutes to the baking time since it will be cold from the fridge.

See? Fancy dinner doesn’t have to be hard. You just made a restaurant-worthy seafood lasagna on a weeknight. Give yourself a high-five.

This recipe is built for real life. It’s your secret weapon for turning a hectic night into something deliciously special. If you’re craving a heartier, meat-based version, be sure to check out our Rich Meat Sauce Lasagna Soup for another comforting family favorite.

Now go enjoy that creamy, cheesy, seafood-packed victory.

I want to hear about your win! Did you try a swap? Did the family love it? Let me know how it goes by leaving a comment and rating below!