Marinate the prawns with salt and set aside.
Heat oil in a non-stick pan. Add cumin seeds and saute for a minute. Add prawns and saute for two to three minutes.
Add spinach, turmeric powder, coriander powder, cumin powder , green chillies and salt and cover and cook on low flame or till the water dries up.
Remove the lid and cook further for two minutes.Serve hot.