In a large mixing bowl, mix together curd, salt and chaat masala powder. Remember that the sev already has spices, so do not add too much salt or masala.
Once its mixed well, add tempering of cumin seeds or mustard seeds and curry leaves (You can use either mustard seeds or cumin seeds, I have used cumin seeds here).
Just before serving, add thick sev to the raita, and enjoy the crunch!