01 - Preheat oven to 400°F. Grease a 2-quart baking dish with butter or cooking spray.
02 - Bring a large pot of salted water to boil. Cook pasta until al dente according to package directions. Drain well and set aside.
03 - In a large saucepan over medium heat, melt 4 tbsp butter. Add minced shallot and sauté for 2 minutes until softened. Add garlic and cook for 1 minute until fragrant.
04 - Sprinkle flour into the saucepan and whisk constantly for 1-2 minutes to form a roux. Cook until flour is fully incorporated but not browned.
05 - Gradually whisk in warm milk and heavy cream, stirring constantly to prevent lumps. Continue whisking for 4-5 minutes until sauce thickens and coats the back of a spoon.
06 - Reduce heat to low. Stir in Gruyère, sharp white cheddar, and Parmesan cheeses until melted and smooth. Add Dijon mustard, paprika, salt, black pepper, and cayenne. Mix until fully incorporated.
07 - Fold cooked pasta and chopped lobster meat into the cheese sauce until evenly distributed.
08 - Pour the lobster mac and cheese mixture into the prepared baking dish, spreading evenly.
09 - In a small bowl, combine panko breadcrumbs, melted butter, and chopped parsley. Mix until crumbs are evenly coated.
10 - Sprinkle breadcrumb mixture evenly over the pasta. Bake for 18-22 minutes until topping is golden brown and sauce is bubbling around edges. Let rest for 5 minutes before serving.