Pour the chai concentrate into a large coffee mug, then heat in the microwave for about 30 seconds. Stir in the brewed espresso and set aside.
Add the milk and vanilla syrup to a microwave-safe glass jar or measuring cup. Stir, then heat in the microwave to be about 200℉/93℃, steaming but not boiling. Froth the warm milk with a milk frother.
Pour the milk over the chai/espresso mixture in your mug, then top with chai spices. Drink up!
Iced Dirty Chai Latte:
Brew your espresso, then pour it into a tall glass over ice.
Stir in the chai concentrate, milk, and vanilla syrup.