To-Die-For Chicken Pot Pie

Ingredients

• 6 carrots, chopped
• 6 stalks celery, chopped
• 1 cup fresh or frozen peas
• 1 cup fresh or frozen green beans, thawed
• 1 cup corn kernels
• 1 yellow onion, diced
• 1 cup quartered red potatoes
• 3 cups chicken broth
• 1 teaspoon thyme
• 0.5 teaspoon salt
• 0.5 teaspoon ground black pepper
• 4 (.87 ounce) packages dry chicken gravy mix
• 4 cups water
• 1 (15 ounce) package double crust ready-to-use pie crusts (such as Pillsbury®)
• 1 whole roasted chicken, bones and skin removed, meat shredded
• 0.25 cup butter, cut into pieces
• 1 egg
• 0.25 cup milk