01 - Preheat oven to 400°F. Lightly grease a small baking dish.
02 - Cook pasta in salted boiling water until just al dente. Drain thoroughly and set aside.
03 - In a medium saucepan, melt 2 tablespoons butter over medium heat. Whisk in flour and cook for 1 minute.
04 - Gradually whisk in the milk and heavy cream. Bring to a simmer, whisking continuously until the mixture is smooth and thickened, about 3 to 4 minutes.
05 - Remove the saucepan from heat. Stir in the cheddar cheese, Gruyère cheese, 1/4 cup Parmesan cheese, Dijon mustard, smoked paprika, salt, and black pepper until the cheeses are fully melted and the sauce is smooth.
06 - Gently fold in the cooked pasta and lobster meat until thoroughly coated with the cheese sauce.
07 - Transfer the macaroni and cheese mixture into the prepared baking dish.
08 - In a small bowl, combine the panko breadcrumbs, 1 tablespoon melted butter, finely chopped parsley, and 2 tablespoons Parmesan cheese. Sprinkle this mixture evenly over the top of the macaroni and cheese.
09 - Bake for 15 to 18 minutes, or until the topping is golden brown and the cheese sauce is bubbling.
10 - Allow the dish to rest for 5 minutes before serving for optimal texture.