In a small bowl mix together Panko and melted butter. Set aside.
In a 3 qt casserole dish mix together cooked pasta and the remaining ingredients (except Panko) until well combined. Top with Panko breadcrumb mixture.
Bake for 30-35 minutes or until the top is golden and casserole is heated through.
Notes
Keep leftover chicken cordon blue casserole in a covered container in the refrigerator for up to 3 days. Reheat portions in the microwave.