Vol-au-Vent (The Best)

Ingredients

• Vol-au-vent

  • 2 sheets (200 g each) store-bought puff pastry, thawed, cold
  • 1 egg, beaten

• Sauce

  • 3/4 lb (340 g) boneless, skinless chicken thighs, cut into large dice
  • 1/4 lb (115 g) white mushrooms, quartered
  • 2 shallots, chopped
  • 1/4 cup (55 g) butter
  • 1 celery stalk, cut into small dice
  • 1 small carrot, cut into small dice
  • 3 tbsp unbleached all-purpose flour
  • 1 1/2 cups (375 ml) milk
  • 1 cup (250 ml) chicken broth
  • 3/4 cup (115 g) frozen green peas, thawed
  • 3 tbsp chives, finely chopped