Pour the milk into a microwave-safe mug, and heat for 2-3 minutes, until very hot.
Add in the sweetener, and using a milk frother, if you have one, froth the milk until a fluffy layer of foam forms on top. If you don't have a frother, just stirring it in works fine :)
Add in the bag of chai tea, and steep for 5-6 minutes, until it reaches desired strength.
Sprinkle cinnamon on top, and enjoy!