Cut the (cold) butter into cubes and place in a large bowl. Use a pastry blender to combine the butter, brown sugar and vanilla until creamy.
Add the flour, salt and chai and continue blending until a dough forms that you can press together with your hands.
Use a 1 1/2 tbsp cookie scoop to measure enough dough for one cookie. Roll the dough in your hands to form a ball and place on a baking sheet lined with parchment. Place each dough ball about 2 inches apart.
Bake for 20-25 minutes, until golden brown around the edges.
After removing the cookies from the oven, allow them to cool for 15 minutes, then dust with powdered sugar using a mesh strainer. Allow cookies to cool at least an additional 15 minutes before eating.