Southern Mac and Cheese

Name: Southern Mac and Cheese
Ingredients: 8 ounces (2 cups) elbow macaroni; Kosher salt; 3 tablespoons unsalted butter; 3 tablespoons all-purpose flour; 3 cups whole milk; 3 cups coarsely grated American cheese, divided; 3 tablespoons finely grated Parmesan; 1 1/4 teaspoons freshly ground black pepper; 1 1/4 teaspoons mustard powder; 1/8 teaspoon paprika