Ingredients
Chicken:
1 container (8 ounces) low-fat plain yogurt
3 tablespoons balsamic vinegar
8 thin-cut boneless, skinless chicken breast halves (bout 1-1/2 pounds total)
Tomato-Mozzarella Topping:
1 tablespoon olive oil
1 medium-size onion, cut into 16 wedges
1/4 cup balsamic vinegar
2 tablespoons water
1 pound plum tomatoes, cored, seeded, chopped (about 4 cups)
1 teaspoon salt
1/2 teaspoon black pepper
1 piece (8 ounces) fresh mozzarella cheese, cut into 1/2-inch dice
1 cup loosely packed basil leaves, chopped

Directions
1. Chicken: In a small bowl, whisk together the yogurt and the 3 tablespoons vinegar until well blended. In a plastic food-storage bag, combine the chicken and yogurt mixture; seal and turn to coat. Refrigerate 20 minutes to marinate.
2. Meanwhile, heat a broiler, or prepare an outdoor grill with medium-hot coals, or heat a gas grill to medium-hot.
3. Tomato-Mozzarella Topping: In large skillet, heat the oil over medium heat. Add the onion; saute for 5 minutes or until slightly softened; the wedges will fall apart into pieces. Add the 1/4 cup balsamic vinegar and the water. Bring to a simmer. Reduce the heat to medium-low; cook until the liquid has reduced to a sauce and onion is tender, about 7 minutes.
4. Increase heat to medium-high. Add tomatoes, salt and pepper; cook 2 minutes. Remove skillet from heat; let cool 2 to 3 minutes. Stir in mozzarella and chopped basil.
5. Remove chicken from bag; discard marinade. Gently rinse chicken and pat dry.
6. Broil or grill chicken about 4 inches from heat 3 to 4 minutes per side or until internal temperature registers 170 degrees F on instant-read thermometer. Place chicken on large platter. Scoop 1/4 cup topping on each chicken piece. Serve immediately or let cool to room temperature. Makes 8 servings.

Nutrition Facts
Calories 224, Total Fat 11 g, Saturated Fat 6 g, Cholesterol 68 mg, Sodium 527 mg, Carbohydrate 6 g, Fiber 1 g, Protein 24 g.
Percent Daily Values are based on a 2,000 calorie diet