Add the sweet potato chunks to the bottom of the slow cooker to form an even layer.
In a small bowl, combine the minced garlic, olive oil, rosemary, thyme, salt, and black pepper.
Rub the garlic herb mixture all over the chicken thighs.
Place the seasoned chicken thighs on top of the sweet potatoes in the slow cooker.
Pour the chicken broth evenly around the chicken and potatoes.
Cover and cook on low for 6 to 7 hours until the chicken is fully cooked and the sweet potatoes are tender.
Sprinkle the chopped parsley over the top before serving.