Pound chicken breasts to even thickness, season with salt and pepper.
Grill or sear chicken in olive oil until cooked through. Set aside.
In a bowl, mix Dijon mustard, honey, mayo, and lemon juice to make the honey mustard sauce.
In a skillet, sauté mushrooms until tender.
Preheat oven to 375°F (190°C).
Place chicken in a baking dish. Top with honey mustard sauce, mushrooms, 2 bacon slices per breast, and shredded cheese.
Bake for 10-15 minutes until cheese is melted and bubbly.
Garnish with parsley and serve warm.