Cook the chicken using your preferred method (stovetop, slow cooker, or Instant Pot). Shred or chop the cooked chicken into bite-sized pieces.
Make the Filling
In a large pot, heat olive oil over medium heat. Add the onion, carrots, celery, and peas. Season with salt and pepper. Cook for about 5 minutes until the vegetables are tender. Transfer the vegetables to a bowl and set aside.
In the same pot, melt the butter over medium heat. Stir in the flour and cook for 1 minute, stirring constantly. Gradually whisk in the chicken broth and milk, and simmer until the sauce thickens (about 5 minutes).
Stir in the cooked chicken and vegetables.
Chill the Filling
If freezing, let the filling cool completely before assembling the pies.
Prepare the Crust
Roll out the pie crust and cut it to fit the size of your air fryer pan. Place the filling in a disposable aluminum pan or air fryer oven-safe dish.
Top with the crust and use a fork to seal the edges. Cut 3 steam vents in the crust.
To Assemble:
Divide mixture among the number of disposable aluminum loaf pans you have. Top with pastry and use fork to seal edges.
Cooking in the Air Fryer
Preheat the air fryer to 350°F (175°C).
Place the assembled pot pie into the air fryer basket. Cook for 20-25 minutes, or until the crust is golden brown and filling is heated through. If the crust begins to brown too quickly, cover the edges with foil.
Freezing the Pie
Wrap each assembled pie in two layers of plastic wrap and one layer of aluminum foil. Label and freeze for up to 2 months.
Cooking from Frozen
Thaw the pie in the refrigerator overnight.
Preheat the air fryer to 350°F (175°C).
Unwrap the pie, brush the top with beaten egg, and cook for 30-35 minutes, or until the crust is golden and the filling is bubbling.