Cream the butter and sugar together in a large mixing bowl or the bowl of a stand mixer.
Add the egg and vanilla. Mix well.
Mix the flour, baking powder, salt, and chai spice in a small mixing bowl.
Add the flour mix to the wet ingredients and mix well until you have a thick cookie dough.
Flatten the cookie dough into a disc and wrap it in plastic wrap. Chill for an hour in the fridge.
Preheat the oven to 350°F (175°C).
Line a baking sheet with parchment paper or a silicone baking mat.
Roll the chilled dough to about ¼ inch thick. Cut out shapes. Flour your cookie cutter as needed to help prevent it from sticking to the dough.
Place the cookies on a large lined baking sheet and bake for 10-12 minutes, or until done and the bottom or edges begin to turn lightly golden.
Allow the cookies to cool on the baking sheet for 5 minutes and then transfer them to a cookie rack. Drizzle with the icing if using.
If using icing, you can also sprinkle the cookies with Chai sugar and gold sprinkles for a pretty, sparkly finish.
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Notes
Chilling for 60 minutes helps prevent spreading, making the cookies thick and soft. Don’t skip this step or your cookies could melt together or spread and thin out.Measure flour accurately by using a baking scale. Alternatively, use the spoon-and-level method: spoon flour into a measuring cup and then level with a knife. Avoid scooping the measuring cup into the flour. It will pack the flour down and you'll overmeasure the flour, leading to dry cookie dough.I measure flour as 120 grams = 1 cup.