In a bowl,add potatoes & mash well with the help of the masher.
Add rice flour,black pepper powder,cumin seeds,salt,red chilli crushed,chaat masala,cornflour, ginger paste & mix well.
Add fresh coriander,mix well & let it rest for 15 minutes.
Grease hands with cooking oil,take a large quantity of mixture & make a ball.
Place on clean working surface (greased with cooking oil) & roll into cylindrical shape with the help of palm and cut into slices then cut into rings using cookie cutter
In a frying pan,heat cooking oil and fry potato rings on medium flame until golden.
Serve with sauce or tomato ketchup.