Heat Oil. Add garlic, stir and add chillies. Add Onion, Capsicum and bell peppers ( in cubes), Stir for a minute.
Add Mushrooms and stir till cooked ( 2-3 Minutes )
Add Soya soya sauce, vinegar and chilly sauce, stir, Add salt and crushed pepper.(Add salt after tasting as, all the sauces have salt) ( Use a flat pan and high flame ) ( you can add corn starch and water if you want gravy for main course)