1. Debone chicken, cut it into pieces, rinse and drain.
2. Marinate chicken with soy sauce, sugar and corn starch for 10 minutes.
3. Cut red onion and red chilli pepper diagonally; rinse Thai sweet basil, then pluck the leaves out. Mix Maggi sauce, sugar, oyster sauce and corn starch, set aside.
4. In a heated skillet, add a little oil, pan fry chicken pieces in medium heat until golden brown, remove from skillet.
5. Reheat skillet, add oil, sauté Shimeji mushroom and red onion with a bit of water, toss in Thai sweet basil leaves and red chilli, return chicken to skillet, sauté briskly, add seasoning mixture, stir until sauce thickens, serve.