01 - Place the chicken breasts in an even layer across the bottom of the slow cooker.
02 - In a mixing bowl, whisk together the brown sugar, soy sauce, minced garlic, apple cider vinegar, smoked paprika, and black pepper until fully combined and the sugar has dissolved.
03 - Pour the sauce evenly over the chicken breasts, ensuring each piece is well coated.
04 - Cover the slow cooker and cook on low for 4 hours or on high for 2 hours, until the chicken reaches an internal temperature of 165°F and is tender throughout.
05 - Remove the chicken from the slow cooker and shred using two forks or slice into portions. Spoon the accumulated sauce over the top of each serving.
06 - Finish with a sprinkle of chopped fresh parsley and sliced green onions. Serve immediately while hot.