Chicken and Root Vegetable Pot Pie

Name: Chicken and Root Vegetable Pot Pie
Ingredients: 3 cups low-sodium chicken stock; 1 cup diced Yukon Gold potatoes; 1 cup diced sweet potatoes; 1 cup diced celery root; 1 cup diced parsnip; 1 large white onion, diced; 1 pound boneless, skinless chicken breasts, diced; 2/3 cup all-purpose flour; 1 1/2 cups whole milk; 1 cup fresh or frozen peas; 1/4 cup chopped flat-leaf parsley; 2 tablespoons chopped cilantro; 1 teaspoon hot sauce; Salt and freshly ground black pepper; 1 sheet frozen puff pastry dough, thawed