To make the rolls: Mix the flour,milk and salt in a vessel. Now using little water knead a soft dough. The dough should neither be too stiff nor too soft.Keep it aside for 15 mins.
Knead the dough and divide it into equal parts and roll out thin rotis.Heat tawa and cook the rotis on both sides. Keep rotis in casserole.
To make the stuffing: Mix all the ingredients of marinate well and then add paneer cubes. Let the paneer marinate for 15-20 minutes.
Heat oil in a pan and fry capsicums and onion for 2-3 minutes. Now add marinated paneer and saute for 5-6 minutes on medium flame stirring occasionally. Now add tomatoes and saute for another minute. Remove from heat.
To make a roll:Take a roti and spread some green chutney in the center, then put the paneer-capsicum-onion-tomato stuffing evenly in the center. Sprinkle thinly sliced onion and some chat masala. Now roll the roti vertically tightly ensuring that no stuffing falls out.
Then wrap each roll in a tissue paper or aluminium foil. Arrange on a platter and serve with green chutney.