Classic Chicken Potpie

Ingredients

• 1 cup potatoes, peeled and chopped
• 1 cup sliced carrots
• 1/3 cup chopped yellow onion
• ½ cup butter or margarine
• ½ cup all-purpose flour
• ¾ tsp salt
• ½ tsp dried thyme, crumbled
• ½ tsp ground black pepper
• 1 ½ cups chicken stock or reduced-sodium canned chicken broth
• ¾ cup milk
• 2 cups chopped, cooked chicken
• ½ cup frozen peas
• ½ cup frozen corn
• Crust pie pastry