Make marinade by mixing together mustard, honey, and lemon juice. Add chicken breasts and refrigerate for two hours. Preheat oven to 350 degrees F. Heat a small amount of oil (canola or vegetable) in a skillet and add chicken breasts, discarding marinade. Cook chicken a few minutes on each side. Set aside. Scrape out most of the juices from the pan, and add mushrooms. Saute mushrooms until tender (a few minutes). Assemble chicken in a large baking dish: chicken, then bacon, then mushrooms, then cheese. Bake at 350 degrees F for about 20 minutes, until chicken is cooked through. Sprinkle with chopped parsley before serving.