When it comes to grilling, chicken breasts can be problematic, especially boneless, skinless chicken breasts. The meat itself is lean, and without the bones to insulate it or skin to protect it, that naked chicken breast on the grill has a tendency to easily overcook and dry out.
So, what to do?
One method is to marinate chicken cutlets, or chicken breasts pounded to an even thickness, and quickly grill them on high heat. We use this method for our cilantro lime chicken and it works fine.
Another way, which doesn't require you to change the shape of the chicken breasts,