First peel off the potatoes and cut it in round shape like this.

Now take chickpea flour(Besan) in a bowl add red chilli powder, turmeric powder, coriander powder, salt and coriander leaves into it.

After that mix it well and add little amount of water into it and with the help of a whisk mix it nicely to form a smooth batter. (water as required for smooth consistency of batter).

Now heat a pan with oil.