Vol-au-Vent-Style Chicken on Baguette

Ingredients

• • 2 carrots, diced
  • 2 celery stalks, diced
  • 1 onion, finely chopped
  • 2 tbsp butter
  • 2 tbsp unbleached all-purpose flour
  • 1 cup (250 ml) milk
  • 1 cup (250 ml) chicken broth
  • 1 1/2 cups (255 g) cooked chicken cut into large dice
  • 1/2 cup (75 g) frozen peas
  • 1 baguette, halved lengthwise