Heat 2 tbsp of oil in a wok or your preferred pan.
Saute ginger, garlic, sliced serrano, chopped cilantro stems and chopped white part of scallions till raw smell of garlic is gone.
Add cubed onions and green bell peppers. Saute them on high flame until they are charred but still holds their crunch. This step should not take too long.
Once the onions and bell peppers are charred, add dark soy sauce, red chili sauce, vinegar, ketchup, salt and pepper. Mix well.
Quickly mix 1 tbsp of corn starch with 2 tbsp of water. Mix it well so there are no lumps in it.
Slowly add corn starch slurry over cooked onions/pepper in a wok while stirring continuously.
Keep cooking it until the chili coating gets thick and changes color to little dark brown.
Add prepared paneer to the pan and coat all the paneer cubes evenly and carefully.
Garnish chili paneer with chopped cilantro and scallions (the green part). Mix well and adjust salt pepper if needed.
Serve it hot, warm or room temperature as an appetizer!