Place the potatoes in a large saucepan and cover with water. Bring to a boil and let it cook for 8-10 minutes until it is parboiled (not fully cooked). Drain the water and let the potatoes cool.
Using a grater finely shred the potatoes. Then squeeze out the water if any with your hands or a clean cloth.
Transfer the potatoes in a bowl. Add in the flour, scallions, chilli powder, cumin powder and the chaat masala and mix. Form the mixture into tots of desired shape.
Heat oil in a pan over medium heat and fry the tots till golden brown and crispy. Serve hot.