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 well and set aside.
03 - Melt 4 tbsp butter in a large skillet over medium heat. Add minced garlic and sauté for 1 minute until fragrant. Add chopped 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 with remaining butter. Whisk constantly for 1 minute to cook out raw flour taste.
05 - Gradually whisk in milk, stirring constantly to prevent lumps. Cook until sauce thickens, about 4–5 minutes. Reduce heat to low. Add Gruyère, cheddar, and Parmesan cheeses, stirring until completely melted and smooth. Season with salt, pepper, and smoked paprika.
06 - Stir cooked pasta and lobster meat into cheese sauce, mixing gently to coat evenly. Transfer mixture to prepared baking dish.
07 - In a small bowl, combine panko breadcrumbs, melted butter, and grated Parmesan. Mix until breadcrumbs are evenly coated.
08 - Sprinkle breadcrumb mixture evenly over pasta. Bake for 15–18 minutes until topping is golden brown and sauce is bubbling around edges.
09 - Let dish rest for 5 minutes before serving to allow sauce to set. Garnish with chopped fresh parsley if desired.