Add chicken cubes to a bowl, add milk and rub the chicken gently with milk to remove the odor. Discard the milk, rinse with water, drain the water and set aside the chicken cubes.
Slice the shiitake mushrooms into thin slices.
Heat a pressure cooker, add chicken, shiitake & shimeji mushrooms, carrots, ginger, broth powder, salt, pepper, water, rice, mix well, close the lid and pressure cook until 2 whistles, approx. 7 minutes.
Let the cooker de-pressurise by itself, open the lid and set the cooker to heat on medium. Add cornflour slurry, mix continuously till it boils and cook for 2-3 minutes.
Top with toasted sesame oil and serve hot.