1. Marinate chicken with marinade for 15 minutes. Cut onion in chunks. Cut green pepper in half, take out seeds. Then cut in chunks. Shred garlic. Peel carrot and cut in half, then cut in chunks. Peel and slice potato.
2. Heat the oil, stir fry onion. Put in chicken, garlic, carrot and potato. Put 1 cup of water. Cover the lid and cook in mid-low heat for 25 minutes.
3. Take out excess oil from pot. Put in white sauce bricks and green pepper. Cover the lid and cook for 3 minutes. Season with sugar and salt. Thicken the sauce with cornstarch water.