Use your hands to squeeze out the excess liquid from the zucchini. Place zucchini in a bowl. Add the haloumi and corn. Stir to combine. Make a well in the centre and add the egg, flour and oregano. Season and stir until well combined.
Preheat an air fryer to 200C. Drop tablespoonfuls of the zucchini mixture onto the air fryer rack. Cook for 8 minutes or until crisp and golden. Transfer to a plate. Repeat with the remaining mixture in 2 more batches.
Arrange warm fritters on a serving plate. Place yoghurt in a small serving bowl. Season the yoghurt with black pepper and drizzle over olive oil, if using. Serve scattered with extra oregano.
