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 al dente, about 1 minute less than package directions. Drain and set aside.
03 - Melt 4 tbsp butter in a large skillet 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 - Sprinkle flour into the same skillet and whisk for 1 minute to cook out raw flour taste.
05 - Gradually whisk in milk, stirring constantly to prevent lumps. Cook until thickened, about 4–5 minutes. Reduce heat to low. Add Gruyère, cheddar, and Parmesan cheeses, stirring until melted and smooth. Season with salt, pepper, and smoked paprika.
06 - Stir cooked pasta and lobster meat into the cheese sauce, mixing gently to combine. Pour mixture into the prepared baking dish.
07 - In a small bowl, combine panko breadcrumbs, melted butter, and Parmesan cheese. Mix until evenly coated.
08 - Sprinkle breadcrumb mixture evenly over the pasta. Bake for 15–18 minutes, or until topping is golden brown and sauce is bubbling around the edges.
09 - Let rest for 5 minutes before serving to allow sauce to set. Garnish with chopped parsley if desired.