Heat oil in a non stick pan. Add jeera and a pinch of Hing. Add chopped green chillies. Now add dhaniya powder, garam masala, red chilli, amchoor and stir for a moment. Add choliya and stir again cook for 2-4 mins and then add chopped tomatoes to it. Cover the pan with a lid and let the tomatoes be soft. Now put some water and cook the chana covered on low heat till it's done. Add salt to taste and then add Chaat masala. Adjust seasoning and transfer it to a serving bowl.