Lightly grease a 9×13 baking dish with cooking spray. Preheat oven to 350 degrees. In a bowl, combine the bread crumbs and melted butter. Set aside.
Lay the cut chicken breasts in a single layer in the baking dish. Layer each chicken breast with two slices of ham, overlapping so they cover entire breast. Then over the ham layer two slices of swiss cheese overlapping to cover ham. Repeat over all chicken breasts. Sprinkle the bread crumbs over the tops of the chicken.
Bake the chicken for 30-35 minutes, until the chicken is cooked through and cheese is bubbling, and bread crumbs are golden brown.
While the chicken bakes, in a medium saucepan on medium heat, melt the 2 tablespoons of butter. Stir in the flour, whisking constantly. Cook for about a minute. Slowly pour in the milk, still whisking constantly. Stir in the chicken bouillon granules, and salt. Continue to whisk constantly until the mixture begins to simmer and thicken, about 3-5 minutes. Once the sauce has thickened, turn the heat down to low and stir in the mustard, worcestershire sauce and Parmesan cheese. Stir until the cheese has melted. Keep the sauce warm until chicken is finished cooking.
Serve each chicken cordon bleu with warm sauce. ENJOY!
**Please use fresh bread crumbs. Not store-bought. It really helps this chicken taste so great!