Preheat oven to 400F (200C).
In a bowl, whisk together olive oil, vinegar, Dijon mustard, honey, salt and pepper.
Place chicken in a large baking dish (about 9-inch by 13-inch) that has been sprayed with cooking spray. Sprinkle chicken with a little bit of salt and pepper, to taste.
Pour honey mustard sauce over chicken and toss to make sure that each piece of chicken is well coated. Top with chives, half of the bacon, and cheddar cheese (in that order).
Bake, uncovered, for 20-30 minutes, or until meat thermometer reads 165 degrees F and chicken is cooked through. The total cooking time will depend on the thickness of your chicken breasts. During the final 5 minutes, add remaining bacon to the top of the chicken. It will get nice and crispy as the chicken finishes cooking
Garnish with additional fresh chives just before serving, if desired.