Place the bread in a bowl, cover with water, soak for about 10 seconds, then squeeze out the excess water. Place the drained bread in a food processor with the prawns, chilli, garlic, coriander, salt and egg. Pulse until well blended.
Preheat the oven to 200 degrees celcius. Using lightly floured hands divide the mixture into 12 small cakes. Spray a baking sheet very lightly with oil and arrang the prawn cakes onto the baking sheet, evenly spaced apart. Spray with a little oil and bake for 15-20 minutes minutes, turning half way through, until golden brown and just begining to crisp. Aerve warm with baby lettuce, rocket or watercress leaves and a bowl of sweet chilli sauce.