Step 1: Cook the Pasta: Bring a large pot of salted water to a boil. Cook pasta according to package directions until al dente. Drain and set aside.
Step 2: Prepare the Lobster: Heat 1 tablespoon butter in a skillet over medium heat. Add chopped lobster, season lightly with salt and pepper, and sauté for 2–3 minutes until warmed through. Remove from heat.
Step 3: Make the Cheese Sauce: In a large saucepan, melt 2 tablespoons butter over medium heat. Whisk in flour and cook for 1–2 minutes until lightly golden. Gradually whisk in milk and cream, cooking until thickened, about 5 minutes. Remove from heat and stir in shredded white cheddar until smooth. Season with garlic powder, smoked paprika, salt, and black pepper.
Step 4: Combine Pasta, Lobster, and Sauce: Add cooked pasta to the cheese sauce and stir to coat. Gently fold in the cooked lobster pieces.
Step 5: Prepare the Topping: In a small bowl, mix panko breadcrumbs, melted butter, Parmesan, and parsley.
Step 6: Bake the Lobster Mac and Cheese: Preheat oven to 375°F (190°C). Transfer mac and cheese mixture to a greased 9x13-inch baking dish. Sprinkle breadcrumb mixture evenly over the top. Bake for 20–25 minutes until golden brown and bubbly.