In a large bowl, combine the shredded chicken, carrots, peas, potatoes, and onion.
In a separate bowl, mix the chicken broth, cream of chicken soup, garlic powder, salt, and pepper.
Pour the broth mixture over the chicken and vegetables, stirring gently to combine.
Transfer the mixture to the crockpot, spreading it evenly.
Cover and cook on low for 4-6 hours or high for 2-3 hours until vegetables are tender.
About 30 minutes before serving, preheat your oven to 425°F (220°C).
Roll out the pie crust to fit a 9-inch pie dish.
Once the filling is ready, pour it into the pie crust.
Cover with another pie crust, sealing the edges, and cut slits for ventilation.
Bake for 20-25 minutes or until the crust is golden brown.