Skillet Mac and Cheese

Name: Skillet Mac and Cheese
Ingredients: 2 cups 1-inch-wide cauliflower florets; 1 1/4 cups Light-and-Crisp Whole-Wheat Bread Crumbs; 3 tablespoons freshly grated Parmesan cheese; 2 teaspoons olive oil; 3 cups cold low-fat (1%) milk; 3 tablespoons all-purpose flour; 1 1/4 cups shredded extra-sharp cheddar cheese (5 ounces); 1/4 cup shredded Gruyère cheese (1 ounce); 2 teaspoons mustard powder; 3/4 teaspoon paprika; 1/2 teaspoon salt; 1/2 teaspoon freshly ground black pepper; 1/4 teaspoon cayenne pepper; 6 ounces (1 1/2 cups) wholegrain elbow macaroni, cooked for 3 minutes less than the package directions (about 3 cups cooked); Nonstick cooking spray