Preheat your oven to 400°F (200°C).
In a large skillet, melt the butter over medium heat.
Add the diced onion and garlic, sautéing until softened, about 3-4 minutes.
Stir in the flour, cooking for 1-2 minutes to form a roux. This will thicken the filling.
Gradually whisk in the broth, followed by the milk or cream. Continue stirring until the mixture is smooth and thickened.
Season with salt, pepper, thyme, and rosemary.
Add the cubed turkey, peas, carrots, and corn. Stir to combine, ensuring the vegetables and turkey are evenly coated with the sauce. Remove from heat.
Assemble the Pot Pie:Roll out one pie crust and place it in the bottom of a 9-inch pie dish. Pour the turkey filling into the pie crust, spreading it out evenly.
Roll out the second pie crust and place it over the filling. Press the edges together to seal, and trim any excess dough.
Cut a few small slits in the top crust to allow steam to escape.
Brush the top crust with the beaten egg to give it a golden color.
Bake the Pot Pie:Place the pie dish on a baking sheet to catch any drips. Bake in the preheated oven for 35-45 minutes, or until the crust is golden brown and the filling is bubbling.
If the edges of the crust begin to brown too quickly, cover them with foil.
Once baked, remove from the oven and let the pie cool for 10-15 minutes before serving.
Once baked, remove from the oven and let the pie cool for 10-15 minutes before serving.
Serve and Enjoy: Slice the pot pie and serve warm. It pairs wonderfully with a side salad or roasted vegetables.