In a medium bowl, whisk together mango nectar, honey, balsamic vinegar, and water. Mix well.
Season chicken with garlic powder, onion powder, and black pepper. Place seasoned chicken in a large resealable plastic bag. Add the marinade to the bag. Marinate chicken in the refrigerator for 30 minutes.
In a medium skillet, heat olive oil over medium heat. Add onion and garlic. Cook, stirring frequently, until onion is softened and starting to brown. Add chicken and marinade to skillet. Cook until no longer pink and cooked through, turning halfway through cooking, about 8 minutes. Add diced mango and cook about 1 minute longer. Divide chicken and mango into 2 servings.
(Each serving is 7 pt. pls)