Popover Parmesan-Kucai

Bahan-bahan (4 porsi)

• 2 cups milk
• 4 large eggs
• 4 tablespoons unsalted butter (melted)
• 10 oz (280g) all-purpose flour
• 1/2 teaspoon salt
• 1/2 teaspoon ground black pepper
• 1/4 cup Parmesan cheese
• 2 tablespoons fresh chives (chopped)