Using a grinder, grind the Pumpkin Spice Tea to a rough powder. This tea is generally very rough in its loose leaf form and will not infuse well unless it is ground.
Using your mixer with paddle, blend the Pumpkin Spice tea powder with the butter. Allow to sit for 1-2 hours to ensure full flavor of the tea.
Once the butter has been infused with the tea, preheat the oven to 350° and prepare your baking sheet with either a silicon pad or parchment paper.
Cream the butter and tea mixture with the powdered sugar.
Add the flour and salt and blend until a soft dough is formed. This will take some time and will initially start out very crumbly. Continue to mix and it will turn into a soft dough.
Turn the dough out onto a lightly floured surface and roll out ¼ inch thick.
Cut out cookies using a 2 inch circular cookie cutter.
Mix the pumpkin pie spice and casting sugar. Place a large pinch of mixture of top of each cookie.
Bake on prepared cookie sheet for 15 minutes or until lightly brown.
Allow to cool on rack.