In a food processor, process parsley until finely chopped. Dump parsley out into a large mixing bowl. Then add half of cod chunks to the food processor. Grind until the fish reaches a texture like chopped meat. Dump into the mixing bowl with the parsley. Repeat with remaining cod. Add the breadcrumbs with milk, egg, lemon zest, garlic powder, oregano, and salt and pepper to the bowl. Mix everything together.