In a bowl, whisk together bourbon, maple syrup, soy sauce, garlic, ginger, and jalapeno
Put chicken cubes in a zip lock bag, and pour marinade over, making sure the chicken is covered
Refrigerate overnight or at least 4 hours
Remove chicken, discarding marinade
Heat grill to medium-high, and spray with cooking spray or brush lightly with oil
On wooden skewers, thread chicken cubes, peach, and onion pieces, alternating
Grill 8-10 minutes, turning occasionally
Remove from grill and sprinkle with thyme leaves before serving
Notes
Cook time is approximate and will vary depending on your grill. Chicken should be cooked to an internal temperature of 170°To prevent burning, soak wooden skewers in hot water for 10-15 minutes before threading with ingredients.Prep time does not include marinating time.