Cauliflower Mac & Cheese: Secretly Healthy Comfort Food!

Ingredients

• 1 large head of cauliflower, cut into florets (approximately 600g / 21 oz)
• 1 pound (454g / 16 oz) elbow macaroni
• 1 tablespoon olive oil (15 ml)
• Salt and freshly ground black pepper, to taste
• 4 tablespoons (57g / 2 oz) unsalted butter
• 1/4 cup (30g / 1 oz) all-purpose flour
• 3 cups (710 ml / 24 fl oz) whole milk
• 1/4 teaspoon ground nutmeg
• 1 teaspoon Dijon mustard
• 1/2 teaspoon garlic powder
• 1/4 teaspoon onion powder
• 4 cups (approximately 400g / 14 oz) shredded cheddar cheese
• 1 cup (approximately 100g / 3.5 oz) shredded Gruyere cheese (optional)
• 1/2 cup (50g / 1.7 oz) panko breadcrumbs (optional)
• 2 tablespoons (28g / 1 oz) melted butter (optional)