Place an ovenproof dish on the stovetop medium heat and add in some olive oil. Add in sliced onions and garlic. Fry for a couple of minutes.
Once your onion and garlic has softened, add in some ground black pepper, kosher salt, oregano, paprika, chopped chorizo, and chickpeas. Fry for 5 minutes, stirring frequently.
Pour in your chicken stock and cream, give it a stir, then sprinkle in the flour. Stir until the sauce is smooth, then cook for a further 2 minutes. Taste and season with either salt, pepper, oregano, or paprika accordingly. Preheat the oven to 200C/390F.
Add in your raw fresh prawns and give the filling a stir. It should be creamy but not too thick. So if you think it's too thick, add a splash more chicken stock to loosen it up a bit.
Get your filo pastry sheets. Grab a sheet and scrunch it up into a loose ball and place it onto the pie filling. Then continue to cover the whole mixture using up all your filo sheets.
Once you've covered your chorizo, prawn and chickpea pie with scrunched up filo balls, drizzle with melted butter. Place in the oven for 30 minutes or until the filo pastry is golden and crispy. Enjoy with an optional sprinkling of parmesan!