01 - In a medium mixing bowl, combine the Coca Cola, ketchup, soy sauce, apple cider vinegar, brown sugar, minced garlic, smoked paprika, black pepper, and salt. Whisk thoroughly until fully blended and the sugar dissolves.
02 - Place the chicken breasts in a resealable plastic bag or shallow dish. Reserve 1/2 cup of the glaze mixture for basting during grilling, then pour the remaining marinade over the chicken. Seal and refrigerate for at least 1 hour, or up to 8 hours for deeper flavor.
03 - Preheat your grill to medium-high heat (approximately 375°F to 400°F). Lightly oil the grill grates to prevent the chicken from sticking.
04 - Remove the chicken from the marinade and discard the used marinade. Place the chicken breasts on the grill, close the lid, and cook for 5 to 6 minutes per side. Baste occasionally with the reserved Coca Cola glaze. Continue grilling until the internal temperature reaches 165°F at the thickest part of each breast.
05 - Transfer the grilled chicken to a platter and let it rest for 5 minutes to allow the juices to redistribute. Garnish with chopped fresh parsley if desired, then serve warm.