Preheat oven to 180 degrees. Line a baking tray with baking paper.
Beat butter and sugar till just fluffy using a whisk.
Sift in the flour, baking powder and salt into butter mixture. Sprinkle in the cumin seeds.
Using your hands, bring the dough together. If it doesn't hold shape, add 1 tbsp milk at a time and bring together.
Spread out some cling film, transfer the dough into it. Shape into a log and refrigerate for 15 minutes for the dough to set.
Remove the cling film, cut into 1/2 inch thick cookies and line on the tray. I got 15 cookies.
Bake for 18-20 minutes for softer cookies or upto 25 minutes, until done.
Cool on a rack. Enjoy with your cup of chai.