- Place chicken in the bottom of the slow cooker. 
- In a medium bowl whisk together soy sauce, honey, hoisin, vinegar, sesame oil, ginger, garlic and the white parts only of the scallions. 
- Pour the sauce mixture ontop of the chicken and cook for 2-3 hours on low. (Cooking time depends on the thickness of your chicken. My chicken breasts were pretty small and took 2½ hours.) 
- Remove the chicken from the liquid and place on a plate or cutting board. Allow the chicken to rest for a couple of minutes and then shred with two forks or slice it up with a knife. 
- Meanwhile take 3 tablespoons of the liquid out of the slow cooker and pour into a small bowl. Whisk in the cornstarch until smooth and clump free. Slowly add this mixture to the liquid in the slow cooker and whisk until thickened. 
- Add the shredded chicken back to the slow cooker and toss to coat it with the sauce. 
- Serve immediately with sesame seeds and green onions for garnish.