Seafood Mac and Cheese

Name: Seafood Mac and Cheese
Ingredients: Kosher salt and freshly ground black pepper; 2 tablespoons olive oil; 2 cloves garlic, minced; 1 medium yellow onion, diced finely; 1 pound blue or lump crabmeat, picked for shells and chopped; 1/2 cup dry sherry; 2 tablespoons unsalted butter; 1 tablespoon all-purpose flour; 1 pint heavy cream; 1 cup milk; 1 tablespoon chopped fresh parsley, plus more for sprinkling; 1 tablespoon chopped fresh tarragon; 1 tablespoon chopped fresh thyme; 2 teaspoons dry mustard; 1 teaspoon smoked paprika; 4 ounces Gruyere, shredded (about 1 cup); 4 ounces Parmesan, shredded (about 1 cup); 12 ounces extra-sharp yellow Cheddar, shredded (about 3 cups); 1 pound elbow macaroni; 4 ounces cream cheese