Pour the chicken broth into the bottom of the slow cooker.
In a small bowl, mix together the olive oil, kosher salt, onion powder, dried thyme, ground paprika, black pepper, and garlic powder to create the seasoning.
Rub the seasoning mixture evenly over all sides of the chicken breasts.
Place the seasoned chicken breasts into the slow cooker, arranging them in a single layer.
Cover and cook on low for 4-6 hours or on high for 3-4 hours, until the chicken is cooked through and reaches an internal temperature of 165°F.