Prepare the Noodles: Begin by boiling a large pot of salted water and cooking the lasagna noodles according to package instructions until al dente, about 8-10 minutes. Once finished, carefully drain the noodles in a colander and rinse them under cold water to prevent sticking. Lay the noodles flat on a clean kitchen towel or parchment paper while you prepare the garlic butter shrimp scampi sauce.

Sauté the Garlic: In a large skillet over medium heat, melt 4 tablespoons of butter until it bubbles gently. Add 4 cloves of minced garlic to the skillet and sauté for 1-2 minutes, or until fragrant and lightly golden, stirring frequently to prevent burning.

Cook the Shrimp: Add 1 pound of large shrimp to the skillet, ensuring they're in a single layer. Sauté for 2-3 minutes per side, or until the shrimp turn pink and opaque. Once cooked, remove the shrimp from the skillet and set aside on a plate.

Make the Sauce: In the same skillet, add another tablespoon of butter and sprinkle in 2 tablespoons of flour, whisking continuously for about 1 minute until the mixture is bubbly and lightly golden. Gradually incorporate 2 cups of milk, whisking until smooth. Cook for 3-5 minutes until the sauce thickens enough to coat the back of a spoon.

Add Cheese and Season: Once the sauce has thickened, stir in 1 cup of grated Parmesan cheese until it melts and combines beautifully. Season your sauce with salt and freshly cracked pepper to taste, stirring well.

Preheat the Oven: Preheat your oven to 375°F (190°C).

Layer the Lasagna: In a 9x13 inch baking dish, spread a thin layer of the garlic butter sauce on the bottom. Lay down 3-4 lasagna noodles side by side, followed by another layer of sauce, a handful of sautéed shrimp, and a sprinkle of mozzarella cheese. Repeat these layers until all ingredients are used.

Bake the Lasagna: Cover the baking dish tightly with aluminum foil and place it in the preheated oven. Bake for 25 minutes. After this time, remove the foil and continue baking for an additional 10 minutes until the top is bubbling and golden brown.

Garnish and Serve: Once baked, remove the lasagna from the oven and let it cool for about 10 minutes. Garnish your Garlic Butter Shrimp Scampi Lasagna with chopped parsley before slicing and serving.