Take a bowl; add corn flour, maida, soy sauce, salt and make a smooth batter by adding ¼ cup of water.
Coat Paneer pieces with the batter and deep fry in hot oil over a high flame till Paneer is golden brown. Drain on absorbent paper and keep aside.
Now take another small bowl; add tomato ketchup, soy sauce, chili sauce, black pepper, vinegar and 1 tsp water and make a sauce, keep aside.
Heat the oil; add the ginger- garlic, chopped onion, green chilies and sautover a high flame for 1 to 2 minutes. Add diced bell pepper and saut for a 1-2 min. on high flame. Add already made sauce, salt and stir them on high flame for 2-3 minutes then add fried Paneer, toss and mix well.
Chilli Paneer is ready, garnished with chopped spring onion.