Waffled Macaroni and Cheese

Name: Waffled Macaroni and Cheese
Ingredients: 3 tablespoons unsalted butter, plus more for greasing pan; Salt; 1 pound elbow or shell pasta; 3 tablespoons all-purpose flour; 1 1/2 cups milk; 1/2 teaspoon yellow or Dijon mustard; 1/4 teaspoon freshly ground black pepper; 2 cups shredded extra-sharp cheddar cheese; 1/2 cup grated Parmesan cheese; 2 large eggs; Pinch each of salt and freshly ground black pepper; 1 cup all-purpose flour; 1 cup seasoned bread crumbs; 1/4 cup grated hard cheese, such as Parmesan or Pecorino Romano; Nonstick cooking spray; Belgian or standard waffle iron