For the Iced Chai Latte, first prepare the chai tea as usual. The tea will get cold faster if you immediately pour the boiling water over ice cubes and let the tea steep in it.
Sweeten with brown sugar to taste. While the tea is cooling, steep a cinnamon stick in it. When the tea is cold, mix with the milk and pour the Iced Chai Latte over glasses filled with ice cubes.