Garlic Parmesan Scalloped Potatoes

Bahan-bahan (6 porsi)

• 4 tablespoons butter
• 1 tablespoon garlic (minced or 4 large garlic cloves, minced)
• 4 tablespoons all-purpose (or plain flour)
• 4 cups milk (skim, 2% or full fat - more if needed)
• 1 teaspoon chicken bouillon powder (or Kosher salt)
• 1 pinch salt (to taste)
• 1/2 teaspoon black pepper
• 2 1/2 pounds Yukon Gold potatoes (or Russets, peeled and sliced into 1/8-inch - 1/4-inch rounds)
• 2 cups shredded mozzarella cheese
• 3/4 cup parmesan cheese (freshly grated)
• 1 tablespoon fresh chives (divided)