In a bowl add and mix all the ingredients under sauce mix section. No need to add salt as sauces already have sauce in it. Mix nicely.
Make slurry with another 2 tbsp of cornstarch in 1/4 cup water.
Finely chop ginger and garlic, cube onion and bell peppers.
Cut Paneer into cubes.
In a bowl add flour, 2 tbsp cornstarch, red chilli powder, salt and make thick batter with water. Make sure no lumps are there.
Dip paneer cubes in batter, coat nicely. For restaurant style Paneer Chilli, make thick batter. If you like thinly coated paneer cubes make thin batter. For pan frying paneer cubes see below.
Heat oil in a pan/kadhai, add paneer pieces and fry it. Fry for 5-6 minutes till the pieces are light brown. Don't fry for long as paneer can get hard and chewy.
Take out pieces from the pan and keep aside in a dish/plate.
Add 1-2 tbsp of oil to a pan, when it is hot enough, add chopped garlic saute for a minute, add green chillies and onions and bell peppers saute for another 2 minutes on high flame. Don't fry for long else onions and bell pepper will lose the crunch.
Add sauce mix and then fried paneer cubes. Mix well. Take care not to break paneer pieces.
Add the cornstarch slurry that we prepared in beginning and mix nicely so that it coats the paneer pieces evenly.
Cook for another 2-3 minutes. Take off the flame and add spring onion greens on it and serve hot!!