Mix the chicken with garlic, black pepper, salt, and a little olive oil in a stainless steel bowl.
Preheat the Air Fryer to 150°C until the heater light turns off. Allow 3 minutes.
Place the stainless steel bowl in the Air Fryer and cook for 10 minutes.
Open the Air Fryer and add the chopped ingredients and cornstarch mixture. Mix well.
Cook for another 5 minutes and remove. Let cool.
Place the puff pastry in a small aluminum bowl and spoon the chicken mixture into the puff pastry.
Cut the puff pastry into 1/2-inch strips and place them crosswise over the chicken filling. Brush the egg over the crosswise pastry.
Place the bowl containing the puff pastry in the Air Fryer and cook for 15 minutes.
Remove, and the Chicken Pie is ready to be served.