01 - In a large bowl, whisk together buttermilk, mayonnaise, ranch seasoning, minced garlic, olive oil, dried parsley, black pepper, paprika, and salt until smooth and well combined.
02 - Add chicken cubes to the bowl and toss thoroughly to coat evenly with the marinade. Cover with plastic wrap and refrigerate for at least 30 minutes, up to 2 hours for deeper flavor penetration.
03 - Preheat grill or grill pan to medium-high heat (approximately 400°F). If using wooden skewers, soak them in water for 30 minutes to prevent burning during grilling.
04 - Remove chicken from marinade, allowing excess to drip off. Thread marinated chicken pieces onto skewers, leaving a small space between each piece to ensure even cooking.
05 - Lightly oil the grill grates. Place skewers on the grill and cook for 5–7 minutes per side, turning once, until chicken reaches an internal temperature of 165°F and develops distinct grill marks.
06 - During the final 2 minutes of grilling, sprinkle Parmesan cheese generously over each skewer. Close the grill lid to allow cheese to melt and become slightly golden.
07 - Remove skewers from the grill and transfer to a serving platter. Garnish with chopped fresh parsley if desired. Serve immediately while hot.