Combine marinade ingredients well in a medium bowl to dissolve the honey.
Add the chicken thighs and toss them around to coat them well in the marinade. Refrigerate for 30 minutes to 8 hours while they marinate.
Grill the chicken thighs over a medium flame for 4-5 minutes per side, until the internal temperature reaches 165°F.
Alternatively, use the oven broiler to cook the chicken: Place the chicken on a wire rack over a sheet pan that has been lined with foil. Cook under the broiler for 4-5 minutes per side, until the internal temperature reaches 165°F.
Allow the chicken to rest for 5 minutes, covered with foil to keep it warm.
Toast the ciabatta buns. Slice the peaches into thin slices.
Assemble the sandwich: Divide the goat cheese and spread it over the bottom half of each bun. Top the cheese with a chicken thigh and a drizzle of balsamic glaze, if using. Divide the arugula up over the chicken and top with peach slices and the top half of the bun.
Serve and enjoy immediately.
Nutrition facts are sometimes provided below and are calculated using an online calculator. With specific brands of ingredients and additions, omissions, or substitutions the nutrition facts may change. We encourage you to use your own nutrition facts calculator to obtain the most accurate nutrition facts for your meal.