Homemade Mac and Cheese Casserole

Bahan-bahan (8 porsi)

• 12 ounces elbow macaroni
• ¼ cup butter
• ¼ cup all-purpose flour
• 1 ½ cups milk
• 1 cup half and half (or light cream)
• ½ teaspoon dry mustard powder
• 1 teaspoon onion powder
• ½ teaspoon salt (or to taste)
• ¼ teaspoon black pepper (or to taste)
• 10.75 ounces condensed cheddar cheese soup (1 can, optional)
• 4 cups shredded sharp cheddar cheese (divided)
• ½ cup shredded Parmesan cheese