01 - Preheat oven to 375°F. Grease a 2-quart baking dish with butter or cooking spray.
02 - Bring a large pot of salted water to boil. Cook macaroni until al dente according to package directions. Drain well and set aside.
03 - In a large saucepan over medium heat, melt 3 tbsp butter. Whisk in flour and cook for 1-2 minutes, stirring constantly, until mixture is lightly golden and bubbly.
04 - Gradually whisk in warm milk and heavy cream. Continue stirring constantly for 4-5 minutes until sauce thickens enough to coat the back of a spoon.
05 - Remove saucepan from heat. Stir in cheddar, Gruyère, and Parmesan cheeses until completely melted and smooth. Add salt, pepper, smoked paprika, and cayenne pepper.
06 - Gently fold cooked macaroni and chopped lobster meat into cheese sauce until evenly distributed.
07 - Pour mixture into prepared baking dish, spreading evenly.
08 - In a small bowl, combine panko breadcrumbs, melted butter, and chopped parsley. Mix until breadcrumbs are evenly coated.
09 - Sprinkle breadcrumb mixture evenly over macaroni and cheese. Bake for 20-25 minutes until top is golden brown and sauce is bubbly around edges.
10 - Let dish rest for 5 minutes before serving. Drizzle truffle oil over the top just before serving.