Classic Chicken Pot Pie - Alberta Milk

Ingredients

• 2 carrots, diced
• 1 russet potato, peeled and diced
• 3 tbsp (45 ml) butter
• 1 onion, diced
• 2 cloves garlic, finely chopped
• 2 stalks celery, thinly sliced
• 1/2 tsp (2 ml) dried thyme
• 1/2 tsp (2 ml) salt
• 1/4 tsp (1 ml) pepper
• 3 tbsp (45 ml) all-purpose flour
• 1 1/2 cups (375 ml) milk
• 1 cup (250 ml) low-sodium chicken broth
• 2 tsp (10 ml) Dijon mustard
• 1 lb (500 g) cooked chicken breast, cubed
• 1 cup (250 ml) peas
• 1/2 pkg (397 g pkg) frozen puff pastry, thawed
• 1 (large) egg, beaten