In a medium nonstick saucepan over medium heat, cook and stir the onion, garlic, mushrooms and capsicum until tender, about 5 minutes Mix in prawns and cook until opaque. Remove from heat, and set aside.
In a medium bowl, beat together eggs and milk. Mix in curry powder, salt and pepper.
Heat the olive oil in a medium saucepan over medium heat. Pour in egg mixture and cook 5 minutes or until firm. Top with cheddar cheese, tomato and the onion and prawns mixture. Fold eggs over filling and serve warm.