01 - Preheat oven to 400°F. Grease a 9x13-inch baking dish with butter or cooking spray.
02 - Bring a large pot of salted water to a boil. Cook pasta until just al dente, about 1 minute less than package directions. Drain and set aside.
03 - In a large skillet, melt 4 tbsp butter over medium heat. Add garlic and sauté for 1 minute until fragrant. Add lobster meat and cook for 2–3 minutes until just opaque. Remove lobster with a slotted spoon and set aside.
04 - In the same skillet, sprinkle in flour and whisk for 1 minute to form a roux. Gradually whisk in milk, stirring constantly to avoid lumps. Cook until thickened, about 4–5 minutes.
05 - Reduce heat to low. Add Gruyère, cheddar, and Parmesan cheeses, stirring until melted and smooth. Season with salt, pepper, and smoked paprika.
06 - Stir in cooked pasta and lobster meat, mixing gently to combine. Pour mixture into prepared baking dish.
07 - In a small bowl, combine panko, melted butter, and Parmesan. Sprinkle evenly over the pasta mixture.
08 - Bake for 15–18 minutes, or until topping is golden and sauce is bubbling around the edges.
09 - Let rest for 5 minutes before serving to allow the sauce to set. Garnish with chopped parsley if desired.