In a bowl of a stand mixer attached with paddle attachment, beat the softened butter and sugar until creamy; around 4 minutes.
Scrap the sides and bottom of the bowl, add vanilla and mix for another minute.
Add flour, thandai powder and salt to the butter mix, mix on a low speed until the dough starts coming together.
Transfer the dough on a clean work surface and using your hands bring the dough together by pressing to form a disc; don't knead.
If you are adding food color, divided the dough accordingly and add color.
Warp the dough with a plastic warp and refrigerate for an hour.
Preheat the oven to 350 F. Line two baking sheet with parchment paper or silicon baking mat.
If the refrigerated dough is too hard to roll, let is sit on the counter foe few minutes.
On a floured surface roll the dough to 1/4 inch thickness, cut into desired shape using cookies cutter and transfer the cookies on the baking sheet. Repeat the step for scraps.
Freeze the baking sheets for 10 minutes.
Bake for 15-16 minutes, rotating the sheets halfway through baking. For two sheets bake on middle and lower racks.
Let the cookies stay on the sheet for about 5 minutes before transferring them on a wire rack to cool completely.
Store in an airtight container at room temperature.