# Method:
01 - Preheat the air fryer to 350°F (175°C).
02 - Slice each croissant in half horizontally without cutting all the way through, creating a hinge.
03 - Spread about 2 tablespoons of Nutella inside each croissant, then lightly press the halves together.
04 - Place croissants in the air fryer basket in a single layer.
05 - Air fry for 4 to 5 minutes, or until croissants are golden and Nutella is melted.
06 - Remove carefully and, if desired, top with chopped hazelnuts or powdered sugar. Serve warm.