Preheat oven to 400°F.
Melt the butter in a Dutch oven set over medium heat.
2 tablespoons unsalted butter
Once heated, add in the onion and salt, and cook until softened.
½ onion, ½ teaspoon kosher salt
Add in the garlic and poultry seasoning and cook for another minute.
2 cloves garlic, ½ teaspoon poultry seasoning
Stir in the flour. Then, slowly pour in the chicken broth while whisking.
2 tablespoons all-purpose flour, 1½ cups low-sodium chicken broth
Turn the heat to medium high. Once the mixture is bubbling, reduce to a simmer. Continue whisking until the mixture is smooth.
Stir in the heavy cream.
½ cup heavy cream
Add in the turkey and vegetables, and let the mixture simmer for a few minutes until thickened.
3 cups leftover cooked turkey, 2 cups frozen mixed vegetables
Season with salt to taste.
Layer one pie crust on the bottom of the pie dish. Trim the excess dough.
2 9-inch refrigerated pie crusts
Pour the turkey filling into the crust.
Cover the dish with the second crust, trimming the excess dough, and pinching the edges of the 2 crusts together.
Beat the egg and a splash of water in a small dish. Brush the egg wash over the crust.
1 large egg
With a knife, make a few slits in the top crust for venting.
Bake in the oven for 30-35 minutes. Check pot pie halfway through and cover with tin foil if the crust is becoming too browned.