Crush all spice paste ingredients and 1/2 tsp salt with mortar and pestle until all become a paste. You can use electric spice grinder if you don’t have mortar and pestle. Set aside.
Turn the heat to high. Add water, kwetiau, oyster sauce, kecap manis, chicken stock powder, and black pepper and stir until combine. Then add bok choy, cooked chicken and green onion and stir until combine. Add salt to your taste. Cook until bok choy is cooked about 1-2 minutes. Turn off the heat.
Chicken kwetiau stir fry is ready to serve.