Scalloped Potatoes and Ham

Bahan-bahan (12 porsi)

• 2 tablespoons unsalted butter
• 1 medium onion (1/4-inch diced)
• 6 g arlic cloves (minced (about 2 tablespoons))
• 1 cup whole milk
• ¾ cup low sodium chicken broth (or vegetable broth)
• 1 ½ teaspoons kosher salt (divided)
• ½ teaspoon ground black pepper
• 3 pounds Yukon Gold potatoes (about 6 to 8 medium potatoes)
• 3 tablespoons all-purpose flour
• 2 cups ¼ to ½-inch diced cooked ham
• 4 ounces sharp cheddar cheese (shredded (about 1 cup))
• 2 tablespoons finely grated Parmesan cheese
• Chopped fresh chives (thyme, or parsley, optional for serving)