Heat oil in a pan, saute onions till translucent. Add tomatoes and cook till it gets mushy. Add in ketchup, salt and chilli powder and mix well. Toss in paneer and mix well. Finally garnish with coriander leaves and mix well.
Take roti, spoon the filling in and roll it tightly. You can pan sear it for few minutes. Wrap with foil and put in your lunch box or enjoy immediately.