Cheesy Ham Casserole

Bahan-bahan (10 porsi)

• 1 pound medium shells (or rotini or penne)
• ⅓ cup butter
• ⅓ cup all-purpose flour
• 1 teaspoon onion powder
• ¼ teaspoon dried thyme leaves
• ½ teaspoon salt (more to taste)
• ¼ teaspoon black pepper
• 1 ¾ cups milk
• 1 cup half and half (or light cream)
• 1 teaspoon Dijon mustard
• 3 cups shredded sharp cheddar cheese (divided)
• 1 cup shredded Swiss cheese (or Gruyere cheese)
• 2 tablespoons shredded Parmesan cheese
• 2 cups diced ham
• ½ cup Panko bread crumbs
• 2 tablespoons melted butter
• 1 tablespoon chopped fresh parsley