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 smooth and well combined.
03 - Pour the sauce evenly over the chicken breasts. Cover the slow cooker and cook on low for 4 hours or on high for 2 hours, until the chicken is cooked through and reaches an internal temperature of 165°F.
04 - Remove the chicken from the slow cooker and shred or slice as desired. Spoon the accumulated sauce over the top, garnish with chopped parsley or sliced green onions, and serve hot.