Prick the potatoes with a fork several times. Place them in a microwave-safe bowl filled with water. Cover the bowl with a microwave lid and cook for 14- 15 minutes or until tender.
Drain potatoes and allow them to cool down for 5 minutes.
In a small bowl, add melted butter, olive oil, minced garlic, and herbs. Mix well and set it aside.
Using your palm or back of a fork, gently smash the potatoes until they are in one piece.
Preheat the Steam Combo Microwave Oven to 180°C. On the baking sheet, place the smashed potatoes, rosemary, and garlic cloves. Generously drizzle the herb mixture over them, sprinkle with salt and pepper, and bake for 15 minutes.
Sprinkle a generous serving of grated parmesan or hard cheese on the potatoes and return to the Microwave Oven for 10-14 minutes until they melt and render a crispy texture on the top.
Serve with sour cream topped with chives.