1. With an electric mixer combine the mustard, honey, and 1 Tbsp oil, and lemon juice for 1 minute.
2. Pour 1/2 mixture over chicken in a gallon ziplock to marinate in fridge 2-24 hours.
3. Chill remaining marinade to serve with chicken.
4. After marinating chicken, preheat oven to 375°F Put remaining oil in frying pan. Heat and sear chicken on both sides.
5. Transfer chicken to oven safe pan and brush with marinade.
6. Meanwhile in frying pan add butter and saute mushrooms.
7. Season chicken breasts with salt and peppers.
8. Stack bacon across each breast, spoon mushrooms on each breast and then approx 1/3- 1/2 cup cheese on each.
9. Cover pan with foil and bake 7-10 minutes or until cheese is melted and bubbly. Sprinkle with parsley and serve with honey mustard marinade.