In a small bowl whisk together Dijon mustard, honey, 1 ½ teaspoon of oil and lemon juice. Add the chicken breasts into a large container. Pour about 2/3 of the honey mustard sauce over the chicken. Cover and refrigerate for about 2 hours. Cover the remaining honey mustard sauce, refrigerate and reserve until later.
In a small frying pan melt the butter. Add mushrooms and sauté until the mushrooms have reached your desired tenderness. Remove from heat. Lightly grease a 9×13” baking dish. Heat 1 tablespoon of vegetable oil in a large skillet over medium-high heat. Remove chicken breasts from the marinade (discard the marinade) and season with salt, pepper, and paprika. Add the chicken breasts to the pan and sear on both sides for 3-4 minutes or until golden brown. Place the chicken breasts into the baking dish.
Place into the oven and bake at 350 degrees for 25-30 minutes or until the chicken is fully cooked (the internal temperature has reached 165 degrees). During the last few minutes of cooking top each chicken breast with mushrooms, 2 slices of bacon, ¼ cup Monterey jack, a ¼ cup of cheddar. Bake until the cheese has melted. Sprinkle each chicken breast with a ½ teaspoon of parsley before serving. Serve with the refrigerated honey-mustard sauce.