Place the beef cubes into a bowl. Add olive oil, salt and pepper, and coat well.
Preheat the air fryer to 200°C. Add the beef cubes in a single layer and cook for 6 minutes.
To make the glaze, mix BBQ sauce, honey, smoked paprika, soy sauce, garlic powder and chilli flakes in a bowl.
Open the air fryer after 6 minutes cooking time, and brush the beef generously with the sticky glaze. Cook for a further 4–6 minutes until caramelised.
Meanwhile, mix the yoghurt with lemon juice and season with a little salt and pepper. Pour into a small dipping dish and set aside.
Transfer the hot beef bites to a serving platter, drizzle with any remaining glaze, and scatter with chopped chives.
Serve with cocktail sticks for easy sharing, alongside the yoghurt dip.