Steps
1. Preheat your air fryer to 350°F (175°C).
2. Spread Nutella evenly between the two slices of bread and press them together to make a sandwich.
3. In a bowl, whisk together the egg, milk, vanilla extract, and cinnamon.
4. Dip the Nutella sandwich into the egg mixture, coating both sides well.
5. Lightly grease the air fryer basket with cooking spray or butter.
6. Place the sandwich in the air fryer basket and cook for 5-7 minutes, flipping halfway through, until golden and crispy.
7. Remove from the air fryer, let it cool slightly, then cut it into bite-sized pieces.
8. Serve warm, optionally dusted with powdered sugar or served with fresh fruit.