Heat oil in a large saucepan, add onion and chicken and cook 4 minutes until browned. Add mushrooms.
Combine water, MAGGI Stock Powder, cornflour and MAGGI Liquid Seasoning. Add to pan with creamed corn and corn kernels.
Stir soup until it comes to the boil, stir in CARNATION Light & Creamy Evaporated Milk. Then remove from heat and stir in egg and allow to set. Serve sprinkled with green onion.