Heat oil in a wide pan and add cubed onion, tomato, capsicum and chilli (slit lengthwise). Cook till it becomes soft, no need to change colour. Add all the sauces, salt and pepper powder. Mix well. Add cornflour and mix well. Bring it to boil and reduce flame to the lowest. Add paneer pieces. Gently mix well. Make sure the paneer pieces are coated well with the sauce. Cook for 1-2 mins. Add chopped coriander leaves. Serve with Rice,Chicken Noodles, Veg Noodles, Pulao or Roti.