Classic Comfort Chicken and Dumplings

Ingredients

• 1 tablespoon olive oil
• 1 medium onion, diced
• 2 medium carrots, diced
• 2 celery stalks, diced
• 4 cloves garlic, minced
• 4 cups low-sodium chicken broth
• 1½ lbs boneless, skinless chicken thighs
• 1 teaspoon dried thyme
• Salt and pepper to taste
• 1 cup frozen peas
• ½ cup heavy cream (optional)
• 2 cups all-purpose flour
• 1 tablespoon baking powder
• 1 teaspoon salt
• ½ cup buttermilk
• ¼ cup unsalted butter, melted
• 1 large egg