Creamy Potato and Mozzarella Bake

Ingredients

• 4 (7 oz or 200 g) baking potatoes
• 1/2 cup (4 oz or 125 g) sour cream
• 3/4 cup (13 oz or 375 ml) whole milk
• 1/2 cup (2 oz or 60 g) sharp cheddar, grated
• 1/4 cup (1 oz or 30 g) grated Parmesan cheese
• 1/2 teaspoon (2.5 g) freshly ground black pepper
• 1 cup (4 oz or 125 g) mozzarella cheese, shredded
• 1/2 cup (2 oz or 60 g) fresh chives, chopped