Mom's Chicken Pot Pie

Step 1
Preheat the oven to 425 degrees F (220 degrees C).

Step 2
Melt butter in a large skillet over medium heat. Cook and stir onion, flour, salt, and pepper in hot butter until onion is translucent, about 5 minutes.

Step 3
Pour in broth and milk; bring to a boil and cook until slightly thickened, about 1 minute. Remove the skillet from heat and stir in chicken, peas and carrots, and potatoes.

Step 4
Press 1 pie pastry into the bottom of a 9-inch, deep-dish pie pan. Pour chicken mixture into pie pastry. Top with remaining pastry and press edges together to seal. Cut several slits in top pastry. Place pie on a baking sheet.

Step 5
Bake in the preheated oven until crust is golden brown, about 30 minutes. Let pie cool and filling thicken at room temperature for 15 to 20 minutes before cutting.