01 - Preheat oven to 375°F. Grease a 2-quart baking dish with butter or cooking spray.
02 - Bring a large pot of salted water to a boil. Cook elbow macaroni until just al dente, about 1-2 minutes less than package directions. Drain well and set aside.
03 - In a medium saucepan, melt 3 tablespoons butter over medium heat. Whisk in flour and cook, stirring constantly, for 1 minute to form a roux.
04 - Gradually whisk in milk and heavy cream. Continue whisking until mixture is smooth. Simmer for 3-4 minutes, stirring frequently, until sauce thickens enough to coat the back of a spoon.
05 - Remove saucepan from heat. Stir in sharp cheddar, Gruyère, and Parmesan cheeses until completely melted and smooth. Add Dijon mustard, smoked paprika, salt, and black pepper, mixing well.
06 - Add cooked macaroni and chopped lobster meat to the cheese sauce. Gently fold until evenly coated. Transfer mixture to the prepared baking dish, spreading evenly.
07 - Melt 2 tablespoons butter in a skillet over medium heat. Add fresh breadcrumbs and cook, stirring frequently, until golden brown and crispy, about 2-3 minutes. Remove from heat and stir in parsley, chives, lemon zest, and garlic powder.
08 - Sprinkle the herbed breadcrumb mixture evenly over the macaroni and cheese in the baking dish.
09 - Bake for 20-25 minutes until the top is golden brown and the cheese sauce is bubbling around the edges. Let rest for 5 minutes before serving to allow the sauce to set.