To a large mixing bowl, add the boiled and peeled potato. Mash it with a fork or masher until smooth.
Add the coriander or cilantro leaves, ginger, chilies, salt, coriander powder and cumin powder, and mix well. Taste and adjust for seasonings at this stage.
Add the water chestnut flour (singhare ka atta) and mix well with the potato mixture.
Once it forms a thick mixture, add a few spoons of water to bring everything together and form a smooth dough. You don't have to knead it too much, since this is a gluten-free dough.
Cover and let the dough rest for about 30 minutes. Then divide into equal portions and roll into neat balls.
Roll each ball of dough into a thin paratha of about 6-7 inch diameter. You can't make really big ones, since it will be difficult to roll a gluten-free dough without break.
Add to a hot pan or tawa, cook on medium heat with a little oil. Press and cook on both sides until golden.
Remove and place in a casserole dish, covered with a clean kitchen cloth to keep them soft.
Serve these singhara parathas warm with your desired chutneys or yogurt.