In a medium bowl or large measuring cup, whisk together maple syrup, soy sauce, orange juice, hoisin sauce, ginger, garlic, sesame oil, and salt.
Place chicken in a 6–7-quart slow cooker. Pour the maple syrup mixture over top; toss to coat. Cover and cook on HIGH for 1-2 hours, or on LOW for 2-4 hours, until the chicken reaches an internal temperature of 165°F.
Remove the lid and use two forks to shred the chicken.
In a small bowl, whisk together the cold water and cornstarch until smooth. Stir into the chicken mixture.
Cook, uncovered, on HIGH for 30-60 more minutes to allow the sauce to thicken.
Serve shredded chicken and sauce over rice or noodles. Garnish with optional toppings.