Prepare the sauce. Mix schezwan chutney, soy sauce, red chili sauce, rice vinegar, and brown sugar. Keep it aside,
In the same pan, with leftover oil, add the chopped garlic, ginger and green chilies, sautéing until fragrant.
Next add in the finely chopped onions and scallion whites. Saute until golden and fragrant.
Add salt and black pepper powder to season.
Stir in the prepared schezwan sauce mix and cook for 2-3 minutes until the oil starts to separate.
Now add the diced onions and bell peppers. Stir-fry on high heat for 2-3 minutes to retain their crunch.
Pour in the water or vegetable stock and bring to a simmer.
Add the cornstarch slurry to thicken the sauce, stirring continuously.
Add the fried paneer cubes to the pan and toss gently to coat them evenly with the sauce.
Garnish with chopped spring onions and serve hot.