01 - Preheat the oven to 350°F. Butter a 2-quart baking dish.
02 - Bring a large pot of salted water to a boil. Cook the pasta until just al dente, about 1–2 minutes less than package directions. Drain, set aside.
03 - In a large saucepan, melt 2 tbsp butter over medium heat. Whisk in the flour and cook, whisking constantly, for 1 minute.
04 - Slowly whisk in the milk and cream, ensuring no lumps form. Simmer gently, stirring, until slightly thickened, about 3–4 minutes.
05 - Reduce heat to low. Stir in Gruyère, cheddar, and Parmesan cheeses until smooth and melted. Add Dijon mustard, garlic powder, smoked paprika, salt, and pepper.
06 - Add the cooked pasta and lobster meat to the cheese sauce. Fold gently to combine.
07 - Spoon the mixture into the prepared baking dish.
08 - In a small bowl, mix panko breadcrumbs with melted butter and 2 tbsp Parmesan cheese. Sprinkle evenly over the pasta.
09 - Bake for 20–25 minutes, until bubbly and golden on top.
10 - Let cool for 5 minutes. Drizzle with truffle oil and sprinkle with chives before serving.