Put the flour in a bowl.
Add mashed potato and oil and mix it into the flour.
Add salt also if you are using any.
Add water gradually and make a soft pliable dough.
Cover the dough and let it rest at least for 30 minutes.
Heat tawa or frying pan over medium low heat.
Divide the dough into 10 parts.
Take one part of the dough. Roll it into a ball.
Coat it lightly with the extra flour.
Place on the rolling board or worktop and roll into a circle of 5-6 inch diameter.
In between if the dough sticks, just dust it with more flour.
Put the rolled roti on the tawa.
Roast it till bubbles appear.
Turn it over and roast for 20 -30 seconds.
Can let it puff up over naked flame if you like.
Repeat steps 7 to 14 with the remaining dough.
You can smear a bit of ghee over the rotis before serving.