Preheat your oven to 350°F (175°C) and line a cupcake tin with paper liners.
In a saucepan, melt the 1 cup of butter over medium heat, stirring frequently until it turns golden brown and has a nutty aroma. Be careful to not burn it. Once done, remove from heat and let it cool slightly.
In a mixing bowl, combine the sugar and brown butter. Beat together on medium-high speed until well combined.
Add the eggs one at a time, mixing well after each addition. Then, mix in the buttermilk until smooth.
In another bowl, whisk together flour, baking powder, and chai spice. Gradually add the dry ingredients to the wet mixture, mixing until just combined. Do not overmix!
Fill each cupcake liner about ¾ full. Bake for 18-20 minutes, or until a toothpick inserted into 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.
Once cold, frost them with your choice of creamy frosting—a vanilla or cream cheese frosting works beautifully—and enjoy!