01 - Preheat oven to 400°F (200°C). Lightly grease a small baking dish.
02 - Cook the elbow macaroni or cavatappi in salted boiling water until it is just al dente. Drain thoroughly and set aside.
03 - In a medium saucepan, melt 2 tablespoons of unsalted butter over medium heat. Whisk in the all-purpose flour and cook for 1 minute, forming a roux.
04 - Gradually whisk in the whole milk and heavy cream. Bring the mixture to a simmer, whisking continuously until the sauce is smooth and adequately thickened, approximately 3 to 4 minutes.
05 - Remove the saucepan from the heat. Stir in the grated sharp cheddar, Gruyère, and 1/4 cup of Parmesan cheese until they are fully melted and the sauce is smooth. Incorporate the Dijon mustard, smoked paprika, salt, and freshly ground black pepper to taste.
06 - Gently fold the cooked pasta and the chopped lobster meat into the cheese sauce until all ingredients are evenly coated.
07 - Transfer the lobster mac and cheese mixture into the prepared baking dish, spreading it evenly.
08 - In a small bowl, combine the panko breadcrumbs, 1 tablespoon of melted unsalted butter, the finely chopped fresh parsley, and 2 tablespoons of grated Parmesan cheese. Sprinkle this mixture evenly over the top of the mac and cheese.
09 - Bake in the preheated oven for 15 to 18 minutes, or until the topping is golden brown and the cheese sauce is bubbling.
10 - Allow the mac and cheese to rest for 5 minutes before serving to let the sauce set slightly.