Start by mixing the butter, sugar, and Earl Grey tea in the stand mixer for about 2-3 minutes or until light and fluffy. Add in the room-temperature egg and vanilla and mix just until incorporated.
Now add in the sifted flour, baking soda, baking powder, and salt to the wet mixture and mix just until the flour disappears. You don't want to overmix your cookie dough.
1 1/3 cup flour, 1/4 tsp baking soda, 1/2 tsp baking powder, 1/4 tsp salt
Using a small cookie scooper, scoop 16 equally sized cookie dough balls and place them on a parchment or silicone-lined baking sheet. Place the baking sheet in the freezer for 20 minutes. While the cookies are chilling, turn on the oven to 350 F.
Once the cookies have chilled in the freeze you can either roll them in the granulated sugar right away or roll them in the palm of your hands first and then roll them in the sugar then place them back on the baking sheet.
3 tbsp sugar
Bake the cookies for 10-12 minutes. The cookies will continue baking as you remove them from the oven so don't worry if they look slightly underdone. Let the cookies cool on the baking sheet for 10 minutes, then transfer to a cooling rack. Enjoy!
Notes
Change the ingredient measurements to metric and weigh using a kitchen scale for the best accuracy!