Directions

1. In a saucepan, heat 1 tablespoon of the oil over medium heat. Add the onion and garlic and sauté until the onion is softened, about 3 minutes. Increase the heat to high, add the balsamic vinegar and cook for 3 minutes. Add the remaining ingredients except the Swiss chard and the chicken, and cook for 20 to 25 minutes or until the tomatoes have softened. Remove from heat and transfer to a blender. Blend until smooth. Set aside.
2. In a medium skillet, heat the remaining 2 teaspoons oil. Add the Swiss chard and cook until wilted, about 4 minutes.
3. Arrange 4 plates with 1/2 cup sauce topped with 1/4 cup Swiss chard. Arrange a sliced chicken breast on top of each plate. Serve immediately.