Baked Mushrooms in Parmesan Cream Sauce

mushrooms, cleaned and stems removed

butter

flour

half and half

Swanson® Beef, Chicken or Vegetable Stock

sherry or white wine

freshly ground pepper

Panko bread crumbs (yes, you can use regular crumbs but these offer a better crunch)

freshly grated Parmesan

chopped fresh parsley for garnish (optional)