Easy Chicken Pot Pie Soup (Creamy, Ready in 40 Minutes)

Ingredients

• 4 tablespoons unsalted butter
• 1 medium yellow onion, diced
• 2 celery stalks, diced
• 2 medium carrots, diced
• 3 cloves garlic, minced
• 1/3 cup all-purpose flour
• 1 teaspoon dried thyme
• 1 teaspoon poultry seasoning
• 1/2 teaspoon black pepper
• 6 cups low-sodium chicken broth
• 1 lb (450 g) Yukon gold potatoes, peeled and cubed
• 3 cups cooked rotisserie chicken, shredded
• 1 1/2 cups frozen mixed vegetables (peas, carrots, corn, green beans)
• 1/2 cup heavy cream
• Salt to taste
• Fresh parsley, chopped (for garnish)
• 1 refrigerated pie crust (half a 14.1 oz package)
• 1 egg, beaten