Cut the paneer into large cubical chunks, and transfer them into a bowl or a plate.
Add salt, red chili powder, and corn flour. Toss them well to coat the paneer entirely and make sure that paneer doesn't break. Add a splash of water (to stick the coating properly), and again add corn flour, and toss it.
Now, heat oil in a wok or skillet on medium heat, and deep fry the paneer till golden brown. Set them aside for further use.
Set the skillet on high flame and heat oil. Add chopped scallion bulbs, ginger, and garlic, and saute for 2-3 minutes on high flame.
Add hot water, then add slit green chillies, soy sauce, vinegar, tomato ketchup, salt, and sprinkle some sugar in the mixture. Mix them well.
Pour cornstarch slurry into the mix to thicken the sauce, and stir it rigorously to avoid the formation of lumps.
Add diced scallion bulbs, and bell peppers, fried paneer, and saute them on high heat for a minute.
Finish it off by sprinkling some onion greens on top and your paneer chilli masala is ready to be served.