Preheat the oven to gas mark 7/425oF/220oC/200oC fan and line a baking tray with parchment paper. Spray or drizzle 1 tablespoon of vegetable oil onto the parchment paper, spread the oil around the tray with the back of a spoon and set the tray aside.
Add the prawns to a bowl and season with salt, black pepper, garlic powder, onion powder and paprika. Rub the seasoning into the prawns then add in the plain flour and also rub into the prawns.
Add the egg to a bowl and whisk until combined then add the panko breadcrumbs to another bowl.
Take a prawn and dip it into the bowl with the egg ensuring it gets fully coated. Drain off any excess egg then dip the prawn into the panko breadcrumbs. Turn the prawn a few times in the breadcrumbs to fully coat and then place the prawn on the baking tray. Repeat the process until all prawns are breaded.
Spray or drizzle 2 tablespoon oil onto all the breaded prawns and allow the prawns to sit for 10 minutes.
After 10 minutes, bake the prawns in the top part of the oven for 14 minutes turning halfway through. If the prawns or shrimp are on the smaller side then 12 minutes will do.
Remove the prawns from the oven and and allow to sit for 5 minutes then garnish with coriander and serve with your favourite sauce.