Wash and clean potatoes very nicely in running tap water. Soak for 10 mins. this way it is easy to clean potato of dirt.
In a open pan add enough water to soak potatoes and boil for about 10-15 mins on medium flame. Check with a fork if it is soft enough.
To cook potatoes in Indian Style Pressure cooker, cook potatoes till 3-4 whistles in medium flame and then let the pressure come down on it's own.
Drain water and cool potatoes completely.
In a mixing bowl mix together oil and spices mentioned under smashed potato section.
Add potatoes and mix coating all potatoes nicely in spices and oil.
Smash potatoes with fork or a small bowl or use potato masher.
Preheat oven /otg at 400°F or 200°F. For OTG keep the baking mode with both rods mode on.
Take a baking tray and brush oil on it nicely. Do not use a parchment paper /aluminum foil.
Line potatoes on it avoiding stacking and overcrowding. Keep some space in between the potatoes.
Once more brush little leftover oil potatoes again(if any left).
Bake at 400F/200C from both sides 15 mins each.