Spray your air fryer basket with cooking spray and set aside.
Slice your puff pastry sheets into 4 squares each (8 squares total)
Spread a tablespoon of Nutella on the corner of a square.
Sprinkle diced strawberries over the Nutella.
Fold the square in half to form a triangle.
Use a fork to press down the seams and seal.
Slice an air vent in the center of the turnover.
Repeat until all of the puff pastry is gone.
Brush the egg across the turnovers and place several in the bottom of the air fryer.
Set the air fry setting to 340 degrees F and cook for 7-9 minutes, or until the pastry is cooked through and golden brown.
Allow the turnovers to cool before drizzling with remaining Nutella.