Place chicken in a slow cooker set on low.
In a small saucepan on medium-high heat, combine the sauce ingredients. Simmer to combine, stirring occasionally, for 3-5 minutes.
Pour sauce over the chicken into slow cooker.
Cook for 3-4 hours on low, or until chicken is tender.
An hour before the chicken is ready, preheat the oven to 425F. Pierce sweet potatoes with a fork multiple times in a line horizontally. Bake for 40-50 minutes, or until easily pierced with a fork.
While sweet potatoes bake, combine all the Avocado Ranch ingredients in a bowl and stir well. Store in refrigerator for a minimum of 30 minutes before serving.
Once the chicken is done cooking, remove from the slow cooker and shred with two forks. Return shredded chicken to slow cooker and toss with sauce. Turn slow cooker to warm until ready to serve.
Stuff sweet potatoes with chicken in sauce and top with spring onions/chopped cilantro and Avocado Ranch.