Seafood Lasagna with White Sauce Recipe

You want a show-stopping dinner. But you also want to watch your show. I get it. We’re all running on fumes by Wednesday.

That’s why this Seafood Lasagna with White Sauce is your new best friend. It feels fancy. It tastes incredible. And it doesn’t need you to babysit it all night. If you love creamy, garlicky flavors, you might also enjoy this White Garlic Sauce Shrimp Lasagna Soup.

Forget hours of simmering red sauce. We’re using a simple, creamy white sauce. We’re packing it with sweet shrimp and crab. It’s a baked dinner that does all the hard work for you.

Let’s turn a regular night into a seafood feast. No stress required.

Recipe Overview

• Cuisine: Italian-Inspired
• Category: Main Course
• Prep Time: 20 minutes
• Cook Time: 45 minutes
• Total Time: 1 hour 5 minutes
• Servings: 8

Ultimate Guide to Seafood Lasagna with White Sauce

This is the only guide you need. Why? Because I built it for us—the busy cooks.

Most seafood lasagna recipes are complicated. They have too many steps. They use hard-to-find ingredients.

Not this one. We keep the flavor maximized and the effort minimized. The secret is in the smart shortcuts.

We use no-boil lasagna noodles. They save you a whole pot and a step. The bechamel sauce comes together in one pot in minutes.

And the shrimp and crab? We’re using smart buys from the freezer aisle. This cuts cost and prep time dramatically.

You get layers of tender pasta, creamy sauce, and sweet seafood. All topped with bubbly mozzarella cheese. It’s a guaranteed crowd-pleaser that looks like you spent all day.

The Simple Ingredients

Gathering everything is the first step to a fast dinner. Check your pantry first—you might have a lot of this already!

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

Let’s Get Cooking! (The Step-by-Step)

Ready? This is where the magic happens. Follow these steps and you can’t go wrong.

1. Preheat your oven to 375°F (190°C). Grease a 9×13 inch baking dish.
2. Make the bechamel sauce. Melt the butter in a large pot over medium heat.
3. Whisk in the flour. Cook for 1 minute until it smells a bit nutty.
4. Slowly pour in the milk, whisking constantly. Keep whisking until the sauce is smooth and thick.
5. Remove the pot from the heat. Stir in the nutmeg, a big pinch of salt, pepper, and 1/2 cup of the Parmesan cheese.
6. In a bowl, mix the shrimp, crab, garlic, lemon juice, and parsley. Add a big spoonful (about 1/2 cup) of your white sauce to this mix. This binds it all together.
7. Now, assemble! Spread 3/4 cup of white sauce on the bottom of your baking dish.
8. Place 4 lasagna noodles over the sauce. They can overlap slightly.
9. Spread half of the seafood mixture over the noodles.
10. Spoon 1 cup of white sauce over the seafood. Sprinkle with 1 cup of mozzarella.
11. Repeat the layers: noodles, remaining seafood, 1 cup sauce, 1 cup mozzarella.
12. Top with the last 4 noodles. Pour the remaining white sauce over the top.
13. Sprinkle the last 1 cup of mozzarella and 1/2 cup of Parmesan over everything.
14. Cover the dish tightly with foil. Bake for 30 minutes.
15. Remove the foil. Bake for another 15 minutes until the top is golden and bubbly.
16. Let it rest for 10 minutes before slicing. This is crucial for clean cuts!

What to Serve With This Dish

You’ve got the main event. Now, let’s round out the meal with zero fuss.

A simple green salad is perfect. Toss some mixed greens with a quick lemon vinaigrette. It cuts the richness.

Garlic bread is always a win. Use store-bought and just toast it. Or, grab a crusty baguette.

For a veggie, try roasted asparagus. Toss it in oil, salt, and pepper. Roast at the same temp as the lasagna for 15 minutes. Easy.

Make This Recipe Your Own (Quick Swaps)

Don’t have shrimp? No problem. Make this recipe work for you.

Swap the shrimp for chopped scallops or firm white fish like cod. The cook time stays the same.

Use only shrimp or only crab. Double up on what you love or what’s on sale.

Add a layer of fresh spinach. Just wilt it quickly in a pan before adding it with the seafood. It’s a great way to sneak in greens.

How to Store Leftovers (If You Have Any!)

This reheats like a dream. It might even be better the next day.

Let the lasagna cool completely. Cover the baking dish tightly or transfer portions to airtight containers.

Store in the fridge for up to 3 days. Reheat single servings in the microwave for 2-3 minutes.

For a larger portion, reheat in a 350°F oven, covered, for about 20 minutes. The cheese will get melty all over again. If you’re a fan of classic, cheesy comfort, this Creamy White Cheddar Lasagna Soup is another fantastic make-ahead option.

NUTRITION INFORMATION

• Calories: ~520
• Carbohydrates: 38g
• Protein: 36g
• Fat: 25g
• Saturated Fat: 14g
• Cholesterol: 185mg
• Sodium: 880mg
• Fiber: 2g
• Sugar: 9g

*This is an estimate. Values can vary based on specific ingredients used.

FREQUENTLY ASKED QUESTIONS

Can I use regular lasagna noodles?

Yes, but you must boil them first. Follow the package directions. Dry them well on towels before assembling. The no-boil kind just saves you time.

Can I make this ahead of time?

Absolutely! Assemble the whole lasagna. Cover it and refrigerate for up to 24 hours. When ready, bake it straight from the fridge. Just add 10-15 extra minutes to the covered baking time.

Can I freeze seafood lasagna?

You can. Assemble it but do not bake it. Wrap the whole dish tightly in plastic wrap and foil. Freeze for up to 2 months. Thaw in the fridge overnight before baking as directed.

See? Fancy dinner doesn’t have to be a project. This recipe is your weeknight victory lap.

You get all the credit for a gorgeous, bubbling pan of comfort. With barely any of the usual work. That’s a win in my book. For a heartier, meat-based twist on the lasagna soup concept, be sure to try this Rich Meat Sauce Lasagna Soup.

Now, go reclaim your evening. And then tell me all about it! Did your family love it? What swaps did you try? Let me know by leaving a comment and rating below!