01 - In a medium bowl, combine Coca Cola, ketchup, soy sauce, apple cider vinegar, brown sugar, minced garlic, smoked paprika, black pepper, and salt. Whisk until fully blended and smooth.
02 - Place chicken breasts in a resealable bag or shallow dish. Reserve 1/2 cup of the marinade for glazing later and pour the remainder over the chicken. Seal and refrigerate for at least 1 hour, up to 8 hours for deeper flavor.
03 - Preheat grill to medium-high heat (approximately 375°F to 400°F). Oil the grill grates thoroughly to prevent sticking.
04 - Remove chicken from the marinade and discard the used marinade. Grill chicken breasts for 5 to 6 minutes per side with the lid down, basting occasionally with the reserved Coca Cola glaze, until the internal temperature reaches 165°F.
05 - Transfer chicken to a plate and let rest for 5 minutes to allow juices to redistribute. Garnish with chopped fresh parsley and serve immediately.