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 just al dente, about 1-2 minutes less than package directions. Drain well and set aside.
03 - In a large saucepan over medium heat, melt 4 tbsp butter. Add minced shallot and cook for 2 minutes until softened. Add garlic and cook 1 minute until fragrant.
04 - Sprinkle flour into the saucepan and whisk constantly for 1-2 minutes to form a smooth roux. Do not allow the mixture to 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, white cheddar, and Parmesan until completely melted and smooth. Add Dijon mustard, paprika, salt, black pepper, and cayenne. Mix until fully incorporated.
07 - Add cooked pasta and chopped lobster meat to the cheese sauce. Gently fold until evenly distributed throughout the mixture.
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 the breadcrumb mixture evenly over the pasta. Bake for 18-22 minutes until the top is golden brown and the sauce is bubbling around the edges. Let rest for 5 minutes before serving.