Preheat oven to 375 degrees. Spray a 2-quart baking dish with cooking spray.
Place chicken breasts and diced onion in the prepared dish.
2 lbs. boneless, skinless chicken breasts, 1 cup finely diced onion
In a separate bowl, whisk together soy sauce, honey, hoisin sauce, rice vinegar, garlic, sesame oil and ginger. Pour sauce over the chicken.
½ cup less sodium soy sauce, ¼ cup honey, ¼ cup hoisin sauce, 2 tablespoons rice vinegar, 2 tablespoons minced fresh garlic, 1 tablespoon sesame oil, ½ teaspoon ground ginger
Cover tightly with foil. Bake (covered) for 45-50 minutes, or until chicken reaches an internal temperature of 165 degrees F.
While the chicken is still in the dish (or on a separate cutting board), use two forks to shred the meat. Stir the chicken and sauce together until everything is combined.
Serve shredded chicken over rice, noodles, in tortillas or lettuce wraps, or on salad. Garnish with crushed red pepper flakes, chopped peanuts, and sliced green onion, if desired.
Optional garnish: crushed red pepper flakes; sliced green onion; chopped peanuts, For serving: rice, pasta, tortillas, salad, or lettuce wraps