Prepare baking pan of your choice or just use a baking sheet to make wedges; set aside.
In a bowl, whisk together flour, sugar, baking powder, baking soda, chai spices & salt. With a pastry blender, cut in cold butter until mixture becomes crumbly.
Make a well in the middle of the mixture & pour in cold buttermilk & vanilla; mix until combined.
If you are making the scones in wedges, place the dough on a piece of parchment paper & pat it into roughly an 8-inch circle. Cut the circle into 8 equal sized wedges. Transfer paper with scones to a baking sheet to be baked. If you wish, make scones in whatever shape you prefer. Place unbaked scones in the freezer to chill for about 20 minutes.
Preheat oven to 375 F. Bake chilled scones about 20 minutes or until they test done. Transfer to a wire rack to cool.
While scones are baking & cooling combine a small amount of powdered sugar with milk to make a glaze. Dip each scone into glaze then allow any excess to drip off. Serve either warm or at room temperature.