Remove excess oil from the smoked chicken by microwaving it for 2–3 minutes.
Preheat a frying pan, add oil, and sauté garlic until golden brown.
Add onion and green onion, season lightly with salt, and stir-fry.
When the vegetables are almost cooked, add the smoked chicken, 1 teaspoon oyster sauce, and a pinch of black pepper.