Preheat the oven to 350°F.
Melt butter in a saucepan over medium heat. Add flour and cook for 1 minute, stirring constantly. Whisk in chicken broth and milk a little bit at a time until smooth. Continue stirring until the sauce thickens, about 7 minutes. Let boil 1 minute.
Add in sherry, Dijon, Worcestershire, garlic powder, thyme, and pepper. Remove from heat and stir in Swiss & Monterey Jack cheeses.
Meanwhile, cook pasta al dente according to package directions. Do not overcook. Combine pasta, chicken, ham, and sauce. Pour into a 9 x 13 baking dish.
Combine melted butter, Panko bread crumbs, parmesan cheese & parsley. Sprinkle over top of casserole.
Bake uncovered for 25-30 minutes or until hot and the top is lightly browned. Remove from the oven and rest for 10 minutes before serving.
Source:
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