Heat the oil and fry the onion for 2 minutes. Add the paste and fry again for 1 minute. Add the chilli powder and vegetables and fry for 2 minutes. Add the rice and salt and mix thoroughly. For cheese pattis,Mix the potatoes, paneer, coriander, flour, green chillies and salt and shape like patties. Cook on a tawa with the help of a little oil. Heat the oil and fry the onion for 2 minutes. Add the garlic and fry again for a few seconds. Add the tomatoes, ajwain, chilli powder, sugar and salt and cook until soft. Blend in a mixer. Do not strain. If the gravy is too thick, add a little water. Spread the hot rice in a greased baking dish. Put the cheese patties over the rice. Cover with the tomato gravy and sprinkle grated cheese on top. Bake at 200 degree C (400 degree F) for 10 to 15 minutes. Serve hot.