Put the powdered sugar all-purpose flour, chickpea flour,salt, baking powder and powdered cardamom in a large bowl and mix using your fingers. Sieve the powdered sugar and chickpea flour if necessary, first, to make sure there are no lumps.
Add the yogurt and ghee. Knead softly by hand just till a soft dough forms. The texture should be similar to shortbread dough. Do not over knead or the cookies will not have a soft crumbly and melt-in-the-mouth texture
Pinch off walnut-sized bits of dough and roll into smooth balls. Flatten very slightly and place on ungreased baking sheets. Press a halved (or chopped bits) of almond or pistachio in the centre of each round of dough.
Bake the Nankhatai at 180C (350F) for about 15 minutes or so,till they start becoming a very light golden brown at the edge. Nankhatai, likeshortbread, should have a somewhat pale appearance rather than a brown colour,when they are done.
Let them cool on the baking sheets for about 5 minutes, thencarefully remove them to racks. Cool completely. These cookies firm up oncethey’re cool. They will be light, slightly crisp and crumbly in texture.