Take cottage cheese in a bowl. Add potato, breadcrumbs, cheese, coriander leaves, red chilli powder, chaat masala, green chillies and salt and mix well.
Heat sufficient oil in a kadai.
Discard edges of bread slices and flatten them with a rolling pin. Put the slices on a worktop, place a portion of cottage cheese mixture on one side, roll tightly, trim edges, cut into two parts and secure each with a toothpick.
Deep-fry rolls in hot oil till golden and crisp. Drain on absorbent paper.
Serve hot with tomato ketchup.