Preheat oven to 350°F (175°C). Line baking sheets with parchment paper or silicone liners.
Stir together the cinnamon, ginger, cardamom, allspice, nutmeg, and cloves. Mix 1 teaspoon of the spice mixture with 1/4 cup (50g) sugar.
Whisk together the flour, baking powder, salt, and the remaining spice mixture. Set aside.
Using an electric mixer on medium speed, beat the butter and remaining 3/4 cup (150g) sugar until light and fluffy. Beat in the egg and vanilla extract.
Reduce the mixer speed to low. Gradually add the flour mixture to the butter mixture and mix just until combined.
Using 2 tablespoons of dough at a time, form the dough into balls. Roll each dough ball in the spiced sugar mixture. Place cookies 1 inch apart on the prepared baking sheets.
Bake one pan at a time for 10 to 12 minutes or until lightly browned.
Cool the cookies on the pans on wire racks for 5 minutes. Then transfer the cookies directly onto a wire rack to cool completely.
Notes
To store: Transfer the cooled chai sugar cookies to an airtight container and store at room temperature for up to 5 days.
To freeze: Freeze the cookies either before or after baking for up to 3 months. To bake dough from frozen, simply add a few extra minutes to the baking time.