In a bowl, add red chilli powder, turmeric powder, coriander powder, garam masala, salt, ginger garlic paste and cornflour. Mix well.
Add cleaned and de-veined prawns to the above mixture and sprinkle some water. Make sure prawns are covered with masala.
Leave the marinated prawns for 30 minutes.
Heat a pan and add oil for deep frying. Once the oil is hot, keep the heat to medium and fry till crispy. It would take 2 - 3 minutes. Once done, remove it to a kitchen tissue, so that excess oil is removed.
Serve with lemon wedges and onion rings as an appetizer or serve along with Chettinad Mutton biryani.