01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, salt, and all chai spices in a medium bowl.
03 - Beat butter and powdered sugar until light and fluffy. Incorporate vanilla extract.
04 - Gradually add flour mixture to butter mixture, mixing until just combined.
05 - Roll dough to 1/4-inch thickness on lightly floured surface. Cut with 2-inch round cutter and place 1 inch apart on prepared sheets.
06 - Bake for 12-15 minutes until edges are just golden. Cool completely on wire rack.
07 - Beat butter until creamy. Gradually incorporate powdered sugar until fluffy. Mix in vanilla and spices. Add milk 1 teaspoon at a time to reach thick, spreadable consistency.
08 - Spread or pipe 1-2 teaspoons filling onto flat side of one cookie. Top with another cookie. Repeat until all cookies are assembled.