Creating a delightful Hearty Chicken Pot Pie is simple if you follow these steps:

1. Preheat the Oven: Set your oven to 425°F (220°C).

2. Sauté Vegetables: In a large skillet, heat olive oil over medium heat. Add onions and garlic, and sauté until onions are translucent.

3. Add Vegetables: Stir in carrots, peas, and potatoes. Cook for about 5 minutes until slightly tender.

4. Add Chicken and Seasoning: Incorporate the shredded chicken, thyme, salt, and pepper into the skillet. Stir well to combine all ingredients.

5. Prepare the Sauce: Pour in the chicken broth and heavy cream. If desired, add cornstarch to thicken. Allow the mixture to simmer for 5-10 minutes until heated through.

6. Assemble the Pie: Roll out one of the pie crusts and place it into a pie dish. Pour the chicken mixture into the crust.

7. Cover with Crust: Place the second pie crust over the filling. Crimp the edges to seal and cut a few slits in the top to allow steam to escape.

8. Egg Wash: Beat the egg and brush it over the top crust for a golden finish.

9. Bake the Pie: Place the pot pie in the preheated oven and bake for 45-60 minutes, or until the crust is golden brown.

10. Cool: Once baked, let the pie cool for about 10-15 minutes before slicing and serving.

Following these straightforward steps will help you create a wonderful Hearty Chicken Pot Pie that will impress your family and friends.