Boil sweet potatoes until soft, then mash them until smooth. Lightly crush cumin seeds and add to the mashed sweet potato.
To the sweet potato mixture, add finely chopped green chilli, cashews, green onions, amchur powder, garam masala, chopped coriander, roasted chana flour, and salt. Mix well.
Form the mixture into kebab shapes, pressing gently to hold them together.
Heat oil in a pan and fry the kebabs, turning them until golden and crisp on all sides.
Optionally, sprinkle chat masala on the kebabs before serving for an extra burst of flavour.