Cut the chicken breasts into bite-sized pieces.
In a bowl, combine garlic, olive oil, oregano, salt, and pepper.
Add the chicken pieces to the marinade, ensuring they are well-coated.
Preheat the grill or oven to medium-high heat.
Thread the marinated chicken onto skewers.
Grill the skewers for 10-12 minutes, turning occasionally.
During the last minute, sprinkle Parmesan over the skewers.
Remove from grill and let rest for a few minutes before serving.