# Step-by-Step Instructions:
01 - Preheat the air fryer to 350°F (175°C).
02 - Slice each croissant horizontally without cutting all the way through, creating a hinge.
03 - Spread about 2 tablespoons of Nutella inside each croissant and gently press the halves together.
04 - Place the filled croissants in a single layer inside the air fryer basket.
05 - Cook for 4 to 5 minutes until croissants turn golden and Nutella melts.
06 - Carefully remove croissants and top with chopped hazelnuts or a dusting of powdered sugar if desired; serve warm.