Preheat the oven to 350°F (175°C) and line a standard 12-cup cupcake tin with paper liners.
In a medium mixing bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, and chai spice blend until well combined.
In a large mixing bowl, cream the softened butter and granulated sugar together using a hand mixer or stand mixer on medium speed for about 3-4 minutes until light and airy.
Add the eggs one at a time, mixing well after each addition, then add the pure vanilla extract and mix until combined.
Gradually add the dry ingredient mixture to the butter mixture, alternating with the buttermilk and cooled chai tea, starting and ending with the flour mixture. Mix until just combined.
Evenly distribute the batter into the prepared cupcake liners, filling each about two-thirds full.
Bake in the preheated oven for 18-20 minutes, checking for doneness with a toothpick.
Let the cupcakes cool in the tin for 5 minutes before transferring to a wire rack to cool completely.
In a medium bowl, beat together the softened cream cheese and powdered sugar until smooth, then gradually add the milk until spreadable.
Once cooled, frost each cupcake with the cream cheese frosting using a spatula or piping bag.
Dust the frosted cupcakes with additional chai spice blend for garnish.
Notes
For a stronger chai flavor, increase the amount of chai spice blend.