Toss the diced green onions, lobster, crab, and shrimp meat into a large mixing bowl.
Mix the ingredients until well combined, then sprinkle in the old bay seasoning.
Fold the ingredients then set to the side.
Next, toss the butter into a large sauce pan, and melt over medium heat.
Once the butter is melted, sprinkle in the flour, and whisk until well combined.
Pour in the heavy cream, then whisk until lump free.
Cook the sauce until it thickens, then toss in the garlic.
Next sprinkle in the Italian seasoning, black pepper, and kosher salt.
Whisk, and let cook for 2 more minutes.
Turn off the heat, and remove the pan from the burner
Lightly oil a 9X13 bake dish, then add a little of the white sauce at the bottom.
Next add 3 lasagna noodles, followed by half of the seafood mixture.
Top the seafood off with some of the white sauce, then some cheese, Then 3 lasagna noodles.
Now repeat the layering.
Top off the seafood lasagna with the remaining white sauce, then cheese.
Sprinkle some parsley flakes on top.
Cover the lasagna with foil.
Bake on 350 F for 1 hour and 25 minutes.
Remove the lasagna from the oven, and let sit for about 15 minutes.
Serve, and enjoy!