Mix together cottage cheese, green chillies, red chilli powder, chaat masala, mozzarella cheese, salt and coriander leaves in a bowl.
Place the samosa pattis on the worktop and dampen the edges. Place a portion of stuffing on one side of the sheet and roll the sheet tightly. Seal the edges properly.
Heat sufficient oil in a kadai and deep-fry the rolls on medium heat till golden brown. Drain on absorbent paper. Serve hot with sweet chilli sauce.