Rub the chicken breasts with the seasoning salt, cover and refrigerate for 30 minutes.
Preheat oven to 350 degrees F (175 degrees C). Place bacon in a large, deep skillet. Cook over medium high heat until crisp. Set aside.
In a medium bowl, combine the mustard, honey, corn syrup, mayonnaise and dried onion flakes. Remove half of sauce, cover and refrigerate to serve later.
Heat oil in a large skillet over medium heat. Place the breasts in the skillet and saute for 3 to 5 minutes per side, or until browned. Remove from skillet and place the breasts into a 9×13 inch baking dish. Apply the honey mustard sauce to each breast, then layer each breast with mushrooms and bacon. Sprinkle top with shredded cheese.
Bake in preheated oven for 15 minutes, or until cheese is melted and chicken juices run clear. Garnish with parsley and serve with the reserved honey mustard sauce.
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