
Preheat the oven to 425°F and grease a 9x13 baking tray.
Boil the potatoes in salted water for 15-20 minutes, until tender, then drain well.
Transfer the potatoes to a bowl and drizzle with olive oil, then season with garlic powder, salt, and pepper.
Place the seasoned potatoes on the prepared baking tray and smash them with a fork or masher.
Top with mozzarella cheese and bake for 15-20 minutes until cheese is fully melted and the edges are crispy brown.
Garnish with fresh chives and serve hot.