1.You shall powder sugar and add but that is optional.
2.Brown sugar can be replaced by ½ cup jaggery/cane sugar/coconut sugar. If using any of these, powder well and use. Taste will differ as per the sweetener used.
3.Cardamom is optional but gives nice flavor and aids digestion.
4.Wheat flour is used to bind well. You shall skip wheat flour and use 1.5 cups Ragi flour, but the cookies will crumble while biting and so kids might find difficult to eat without spilling. But adults can eat.
5.Making equal sized cookies will result in even baking, else smaller cookies might brown/burn/char.