Spread cooked rice on a greased 15x10 inch baking pan. Bake at 160ºC for 2 hours or until fried and browned, stirring occasionally; set aside. In a large soup kettle or Dutch oven, combine the broth, chicken, mushrooms, onions, bamboo shoots, water chestnuts, bouillon and garlic powder. Cover and simmer for 1 hour. Add peas; cook for 15 minutes. Just before serving, heat oil in a skillet. Fry rice in hot oil until it is slightly puffed. Ladle soup into serving bowls. Immediately spoon some hot rice into each bowl and it will sizzle.