01 - Place the chicken breasts in an even layer at the bottom of the slow cooker.
02 - In a small 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, ensuring each piece is thoroughly coated.
04 - Cover the slow cooker and cook on low for 4 hours or on high for 2 hours, until the chicken is cooked through, tender, and reaches an internal temperature of 165°F.
05 - Remove the chicken from the slow cooker and shred or slice as desired. Spoon the accumulated sauce from the slow cooker over the top of each portion.
06 - Finish with chopped fresh parsley or sliced green onions if desired. Serve hot alongside steamed rice, quinoa, or roasted vegetables.