- In the pressure cooker, parboil the potato in enough water by taking a whistle and turn off the flame. Drain the water, peel the potato, and cut the potato into 2 pieces. Then, keep it aside. In a bowl, add thick curd, ginger, garlic, garam masala, amchur powder, Kashmiri red chili powder, roasted cumin powder, coriander powder, turmeric powder, salt, black pepper powder, black salt, chaat masala, mustard oil, and kasuri methi. Mix well. Now, place the potato pieces and coat the masala properly to all sides. Cover the bowl with a plate and allow it to rest for half an hour. Preheat the OTG at 200 degrees Celsius for 5 minutes. Take a baking tray, grease it with the oil, and place the marinated potato. Now, sprinkle red chili flakes and some oil. Place the tray on the top rack for 20 minutes. Take the tray out and garnish it with the coriander leaves. Serve hot.