Step 1

Preheat oven to 350 degrees F. Coat a 9-inch x 13-inch baking dish with non-stick cooking spray.

Step 2

In a medium bowl, combine the bread crumbs and melted butter; set aside.

Step 3

If using 2 large chicken breasts, cut the breasts in half to horizontally (like your going to butterfly the cut and then cut through all the way) to create 4 thin chicken breast pieces. Lay the chicken breasts in a single layer in the bottom of your baking dish.

Step 4

Layer each chicken breast with 2 slices of ham so the entire top of the chicken is covered. Break each cheese slice in half and layer over the ham staggering them so that the entire breast is covered. Sprinkle breadcrumbs evenly over the top of each chicken breast.

Step 5

Bake for 30 to 35 minutes, or until the chicken is cooked through (juices run clear). Turn your oven to broil on HIGH and cook the chicken for another minute or two to brown the breadcrumbs.

Step 6

When the chicken is about halfway done, make the sauce. Start by melting the butter in a medium saucepan over medium to medium-high heat. Whisk in the flour to form a roux, cook for 1 to 2 minutes.

Step 7

Pour in the milk and chicken broth while whisking constantly to make sure there are no clumps. Whisk frequently until the mixture begins to thicken and bubble, about 5 to 7 minutes.

Step 8

Next, add in the mustard, Worcestershire sauce, and Parmesan cheese and whisk until the cheese is melted. Season the sauce with salt and pepper to taste.

Step 9

Keep the sauce warm over low heat until ready to serve.

Step 10

Remove the chicken from the oven. Place each breast on a plate and top with sauce. Sprinkle with parsley, if desired.