Steps
1. Cut the chicken breast into small cubes.
2. In a bowl, combine the olive oil, balsamic vinegar, salt, and pepper.
3. Add the chicken cubes to the marinade and let it sit for 15-20 minutes.
4. Preheat the grill to medium-high heat.
5. Thread the marinated chicken cubes and grapes onto skewers, alternating between the two.
6. Grill the skewers for about 8-10 minutes, turning occasionally, until the chicken is cooked through.
7. Serve hot, and enjoy!