In a large skillet, melt the butter over medium heat. Once melted, add the chopped onions and sauté until they are translucent, approximately 2-3 minutes.
Next, add in the diced carrots and continue to cook for an additional 3-4 minutes, stirring occasionally, until the carrots are slightly tender.
Sprinkle the flour evenly over the sautéed vegetables, stirring well to combine. Cook for another 1-2 minutes to lightly toast the flour, giving it a golden brown color.
Gradually pour in the chicken broth and milk while whisking continuously to prevent lumps from forming. Bring this mixture to a gentle simmer, cooking until it thickens to a creamy consistency, about 5 minutes.
Remove the skillet from heat and fold in the shredded chicken, boiled potatoes, frozen peas, dried thyme, and garlic powder. Season generously with salt and black pepper to taste, mixing until well combined. Set aside.
Roll out your pie crust and carefully fit it into a pie plate, ensuring there are no gaps. Pour the chicken filling into the crust, spreading it out evenly.
Place another layer of pie crust over the filling. Seal the edges by crimping with a fork or your fingers, ensuring a tight closure to prevent leaks. Cut several small slits on top of the crust to allow steam to escape during baking.
Brush the top crust with the beaten egg to create a beautiful golden brown finish once baked.
Place the pot pie in the preheated oven and bake for 25-30 minutes, or until the crust achieves a lovely golden and flaky appearance.
Once done, remove from the oven and let it cool for a few minutes before slicing to allow the filling to set slightly.
Notes
Serve hot, garnished with freshly chopped parsley. Pair with a crisp side salad.