Skillet Mac and Cheese

INGREDIENTS

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