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 according to package directions. Drain well and set aside.
03 - In a large saucepan over medium heat, melt 4 tbsp butter. Add shallot and cook 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 roux. Do not allow the mixture to brown.
05 - Gradually whisk in warm milk and cream, stirring constantly until smooth and thickened, about 4-5 minutes.
06 - Reduce heat to low. Stir in Gruyère, cheddar, Parmesan, Dijon mustard, paprika, salt, black pepper, and cayenne. Mix until completely melted and sauce is smooth.
07 - Fold cooked pasta and lobster meat into the cheese sauce until evenly coated.
08 - Pour the mixture into the prepared baking dish, spreading evenly.
09 - In a small bowl, combine panko breadcrumbs, melted butter, and parsley. Mix until well blended.
10 - Sprinkle breadcrumb mixture evenly over the pasta. Bake for 18-22 minutes until golden brown and bubbling. Let rest 5 minutes before serving.