Heat oil, splutter mustard seeds. Saute the onion and green chillies till soft. Add the powders and salt and saute for a couple of minutes.

Add the mashed potatoes and mix well till combined. Make sure the mixture is dry. Switch off the flame and set aside to cool. Divide the mixture into 10 equal balls.

Mix all the ingredients for the batter and add water little by little till you have a very thick batter. I used around 1/2 cup of water.

Heat oil in a kadai till smoking hot. When you drop a little batter, it would push up.

Dip one potato ball into the thick batter and roll using a spoon till evenly coated. Slowly lift and drop into the oil.

Fry on meduim-low flame till golden brown. Remove with slotted spoon and drain on a kitchen towel. Repeat till all the bondas is completed.

Serve warm with a cup of chai!