Making the Easy Creamy Chicken and Mushroom Pie can be broken down into manageable steps. Follow these guidelines for a seamless cooking experience:

1. Preheat Oven: Preheat your oven to 400°F (200°C).

2. Cook Chicken: In a large skillet, heat olive oil over medium heat. Add diced chicken, cooking until browned and cooked through (about 5-7 minutes). Remove and set aside.

3. Sauté Vegetables: In the same skillet, melt butter. Sauté chopped onions and garlic for about 3 minutes until softened. Add sliced mushrooms and cook until they release their moisture and become golden brown.

4. Create Sauce: Pour in heavy cream and stir in the thyme, salt, pepper, and Worcestershire sauce. Bring to a gentle simmer, allowing it to thicken for about 5 minutes.

5. Combine Fillings: Add the cooked chicken back to the skillet, mixing well to coat them in the creamy sauce. Remove from heat.

6. Prepare Pie Crust: Roll out the pre-made pie crust and place it into a pie dish, pressing gently against the sides.

7. Fill Pie: Pour the chicken and mushroom mixture into the prepared pie crust, spreading evenly.

8. Cover with Crust: Roll out the second pie crust and place it over the filling. Seal the edges by crimping with your fingers or a fork. Cut a few slits in the top crust to allow steam to escape.

9. Apply Egg Wash: Brush the top crust with the beaten egg for a golden finish.

10. Bake: Place the pie in the preheated oven for approximately 25-30 minutes or until the crust is golden brown and flaky.

11. Cool: Remove the pie from the oven and allow it to cool for about 15 minutes before serving.

These detailed steps will ensure that your pie turns out delicious and delightful every time.