Heat a large nonstick skillet over medium-high heat.
Add sausage, onion, and celery; saut 5 minutes or until sausage is browned and onion is golden.
Add wine to pan; cook 1 minute or until most of liquid is absorbed.
Rub each side of bread with cut sides of garlic; discard garlic. Coarsely crumble bread; add to sausage mixture. Stir in parsley, 1/4 teaspoon salt, and pepper.
Let stand 5 minutes or until liquid is absorbed; toss to combine.
Place each chicken breast half between 2 sheets of plastic wrap; pound to 1/4-inch thickness using a meat mallet or rolling pin.
Place half of stuffing on one side of each chicken breast half, leaving a 1-inch border around sides. Fold remaining half of each chicken breast over stuffing, and secure with wooden picks.
Sprinkle chicken with remaining 1/4 teaspoon salt.
Heat a large skillet over medium-high heat. Coat the pan with cooking spray.
Add stuffed chicken breast halves to pan; cook 3 minutes on each side.
Add chicken broth, scraping pan to loosen browned bits. Cover, reduce heat, and simmer for 5 minutes or until chicken is done.