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 elbow macaroni until al dente according to package directions. Drain thoroughly and set aside.
03 - Melt 3 tbsp butter in a large saucepan over medium heat. 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 and coats the back of a spoon.
05 - Remove saucepan from heat. Stir in shredded cheddar, Gruyère, and grated Parmesan until completely melted and smooth. Add kosher salt, black pepper, smoked paprika, and cayenne pepper.
06 - Gently fold cooked macaroni and chopped lobster meat into the cheese sauce until evenly distributed.
07 - Pour the lobster mac and cheese mixture into the prepared baking dish, spreading evenly.
08 - In a small bowl, combine panko breadcrumbs, melted butter, and finely chopped fresh parsley. Mix until breadcrumbs are evenly coated.
09 - Sprinkle the breadcrumb mixture evenly over the surface of the mac and cheese.
10 - Bake for 20-25 minutes until topping is golden brown and cheese sauce is bubbly around the edges.
11 - Remove from oven and let rest for 5 minutes. Drizzle truffle oil over the surface before serving warm.