Preheat oven to 400 degrees F. Prepare pie crusts as directed on the box for a Two-Crust Pie using 9-inch pie pan.
1 package refrigerated pie crust
Place a deep skillet or Dutch oven over medium heat, and add 2 tablespoons of oil or butter. After the oil has heated up, add the celery and onion, for 5 to 8 minutes. Add the frozen vegetables and cook another 5 minutes. Add flour and cook for another 5 - 10 minutes.
1/3 cup olive oil, 1 medium onions chopped, 2 small stalks celery, 1 16 ounce package frozen peas and carrots, not thawed, 1/3 cup all-purpose flour
Add chicken broth and bring to a boil. Turn down heat and stir in milk.
2 cups low sodium chicken broth, 1 cup milk
Add the chicken to vegetable mixture and stir until evenly distributed. Add salt, pepper, poultry seasoning, and thyme.
4 cups roasted, 1 teaspoon poultry seasoning, Salt and ground pepper, 1/2 teaspoon dried thyme
Pour mixture into the pie crust covered 9-inch pie plate and cover the chicken and vegetable mixture with the pie shell. Cut 4 slits into the pie crust.
Make an egg wash with by mixing the egg and water in a small bowl. Brush the egg wash on to the top of the crust. Be sure to crimp the edges of the pie shell so no juices spill in oven.
1 egg, 2 tablespoons water
Bake at 350 degrees F (175 degrees C) for 45 minutes or until pie shell is cooked and golden brown.