Preheat the oven to 375 degrees F. Baking your baking sheets with parchment paper.
Cream the butter, sugar, and instant chai together until fluffy. Add the vanilla and egg, mix well. In a bowl, mix the flour, baking powder and salt. Slowly add it to the sugar mixture until beaten smooth.
Add 1/4 cup of sugar to a small bowl. Roll tiny 1/2-inch balls of dough and place them in the sugar. Roll them around to coat and move them to a baking sheet, about an inch apart.
Using the bottom of a glass, press the dough balls until they are slightly flattened out, but not thin.
Bake for approximately 8 minutes.
Once cooled, pipe a small mound of spiced frosting onto half of the cookies (bottom-side-up). Top each cookie with another cookie. Sprinkle with powdered sugar.