1. 1. Preheat the oven to 400°F (200°C).

2. 2. In a large skillet, cook the boneless chicken breast until fully cooked. Remove from skillet and shred into bite-sized pieces.

3. 3. In the same skillet, add mixed vegetables and chicken broth. Simmer until vegetables are tender.

4. 4. Add the shredded chicken back to the skillet and mix well.

5. 5. Transfer the chicken and vegetable mixture into a baking dish.

6. 6. Roll out the pastry dough and place it over the filling in the baking dish, trimming any excess dough around the edges.

7. 7. Beat an egg and brush it over the pastry dough for a golden finish.

8. 8. Bake in the preheated oven for 25-30 minutes, or until the pastry is golden brown and the filling is bubbling hot.

9. 9. Let it cool slightly before serving.

10. 10. Enjoy your delicious Chicken Pot Pie!