Mix soy sauce, sugar, salt, cornstarch, and water in a small bowl.
Heat 1 tbsp oil in a skillet on high flame; add target protein cubes or mushrooms dusted with flour, pan-fry until golden, and set aside.
Heat remaining oil in wok, stir-fry garlic paste and sliced green chilies for 30 seconds until aromatic.
Pour prepared soy sauce mixture into wok and cook for 1 minute until bubbling.
Toss in cooked target ingredients and fresh basil leaves until sauce coats evenly and leaves wilt.