In a small saucepan set over medium heat, brown the butter. Stir the butter occasionally until it turns amber in color and develops little brown specks.
Empty a chai tea bag into a small bowl. Pour the butter over the chai, then set it aside to steep and cool off for 5 minutes.
Add both sugars to a medium sized mixing bowl. Once the butter has slightly cooled off, place a fine mesh sieve over the mixing bowl. Pour the butter through the sieve and over the sugar to filter out the chai tea bag contents.
Whisk in the egg and vanilla until well combined.
Add in the flour, baking powder, baking soda, salt, and chai spices. Use a rubber spatula to fold the mixture together just until no flour streaks remain. Cover the bowl tightly with plastic wrap and place it in the fridge for 30 minutes to firm up.***
Preheat the oven to 350°F / 175°C.
Scoop out heaping 3 tbsp. scoops of the cookie dough and evenly space the cookie dough balls out on a parchment lined cookie sheet.
Bake for 12-14 minutes, or until the edges of the cookies start to turn golden brown.
Once the cookies come out of the oven, I recommend "scooting" them. This just means take a bowl, cup, or biscuit cutter that is slightly larger than the cookie, place it on top of the cookie, and swirl the bowl around to make the cookie a little more round.
Let the cookies sit on the hot baking tray for at least 5 minutes before transferring them to a wire rack to cool.