Preheat an air fryer to 325 degrees F (160 degrees C).

Arrange wonton wrappers on a clean work surface. Place about 1 teaspoon chocolate-hazelnut spread in the center of each wrapper. Moisten edges with water using a pastry brush or your finger. Fold each wrapper in half and gently press edges together to seal. Moisten the two outer corners and press them together. Place filled wontons on a clean plate and spray with cooking spray. Spray air fryer basket with cooking spray. Place wontons in the air fryer basket in a single layer, working in batches if needed.

Air fry until light brown, about 4 minutes. Allow to cool slightly before eating.