Add prawns to a food processor and pulse until chopped. Transfer to a bowl and add egg, panko, garlic, mustard, salt, pepper, paprika, onion powder and basil. Mix until combined, then form into patties (form tightly with your hands, trying to prevent cracking).
Heat a skillet oven medium heat and add half of the olive oil, then cook patties until golden on each side, about 3-4 minutes. Repeat with remaining burgers.
To make the salsa, in a bowl, mix all ingredients together and season to taste.
In a seperate bowl, stir together sour cream, chipotle sauce, lime juice and a pinch of salt and pepper.
Spread on top of burgers, then layer with avocado and peach salsa!