1. Bring broth to a boil in a small saucepan; remove from heat. Stir in couscous. Cover and let stand 4 minutes. Place couscous in a small bowl; fluff with a fork. Cool for 10 minutes. Add 1/4 teaspoon salt, 1/4 teaspoon pepper, and next 8 ingredients (through garlic); toss.
2. Place chicken between 2 sheets of plastic wrap; pound to 1/4-inch thickness. Divide couscous mixture evenly among breast halves; roll up jelly-roll fashion. Secure with wooden picks. Sprinkle chicken with 1/4 teaspoon salt and 1/4 teaspoon pepper.
3. Preheat oven to 400°.
4. Heat a large ovenproof skillet over medium-high heat. Coat pan with cooking spray. Add chicken to pan; cook for 6 minutes or until browned; turn chicken over. Bake at 400° for 5 minutes or until chicken is done.