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 1 minute until fragrant.
04 - Sprinkle flour into the saucepan, whisking constantly for 1-2 minutes to form a smooth roux. Do not let it brown.
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 completely melted and smooth. Add Dijon mustard, paprika, salt, black pepper, and cayenne pepper.
07 - Fold cooked pasta and chopped lobster meat into the cheese sauce until evenly coated.
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 breadcrumbs are evenly coated.
10 - Sprinkle breadcrumb mixture evenly over the pasta. Bake for 18-22 minutes until golden brown and bubbling around edges. Let rest 5 minutes before serving.