Cut the chicken breasts into 1-inch cubes and place them in a large bowl.
In a separate bowl, whisk together the ranch dressing, Parmesan cheese, garlic powder, onion powder, black pepper, and salt until well combined.
Pour the marinade over the chicken and toss to coat evenly. Cover the bowl with plastic wrap and refrigerate for at least 30 minutes, or up to 2 hours for more flavor.
Preheat your grill or grill pan over medium-high heat. If using wooden skewers, soak them in water for 30 minutes to prevent burning.
Thread the marinated chicken onto the skewers, leaving a little space between each piece for even cooking. Brush the skewers lightly with olive oil.
Place the skewers on the grill and cook for about 10-12 minutes, turning occasionally, until the chicken is cooked through and has nice grill marks. The internal temperature should reach 165°F.
Remove from the grill and let rest for a few minutes before serving.