Chicken Tetrazzini

Ingredients

  • 1 tablespoon unsalted butter
  • Cooking spray
  • 1 cup finely chopped onion
  • 2/3 cup finely chopped celery
  • 3/4 teaspoon freshly ground black pepper
  • 1/4 teaspoon salt 3 (8-ounce) packages presliced mushrooms
  • 1/2 cup dry sherry
  • 3 ounces all-purpose flour (about 2/3 cup)
  • 3 (14.5-ounce) cans fat-free, less-sodium chicken broth
  • 2 1/4 cups (9 ounces) grated fresh Parmesan cheese, divided
  • 1/2 cup (4 ounces) 1/3-less-fat cream cheese
  • 7 cups hot cooked vermicelli (about 1 pound uncooked pasta)
  • 4 cups chopped cooked chicken breast (about 1 1/2 pounds)
  • 1 (1-ounce) slice white bread