Preheat your oven to 350°F (175°C) and line a cupcake pan with liners.
In a saucepan, melt the butter over medium heat, stirring constantly until it turns golden brown and smells nutty. Let it cool slightly.
In a bowl, whisk together your flour, chai spice mix, baking powder, and salt until well combined.
In a large mixing bowl, combine the granulated sugar and eggs. Beat using an electric mixer until light and fluffy.
Slowly drizzle the brown butter into the egg mixture while mixing on low speed. Mix until combined.
Alternate adding the dry flour mixture and milk into the butter and egg mixture. Start and end with the dry ingredients and mix until just combined.
Pour the batter into the prepared cupcake liners, filling each about 2/3 full.
Bake for 18-20 minutes or until a toothpick inserted in the center comes out clean.
Allow the cupcakes to cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.