Put few spoons of water in raw peanut (1 cup) in a microwavable plate with some salt (desired level. None is fine too)… And mix well… Water is just to make the peanuts wet… So just a little.. If you end up having more water in the plate .. Drain it.
Microwave one minute .. Take it out and stir. Microwave again for another minute… Stir again.From then onwards I take it out every 30seconds and stir… Until it is ready… When it is very hot… It is hard to tell if it is ready as it will be little chewy… You can keep few peanuts aside to cool and check if it is crispy. Microwave again if it is not crispy.
Usually, I have to do 4-5 30 seconds.
Also when it is done, Color changes a little bit to the light brownish side. Time can vary depending on microwave power.
After few times you will learn what works for your microwave and taste… Do small quantity and try first…