SonicAdd Ham to their classic Grilled Cheese SandwichHamAsk for a "Grilled Ham & Cheese" from the Sonic Secret Menu. This one should be easy to explain.All Locations6 - HighVaries by Locationhttp://hackthemenu.com/sonic/secret-menu/grilled-ham-cheese/The "Grilled Ham and Cheese" sandwich from the Sonic "secret menu" adds a little protein to an otherwise simple grilled cheese sandwich. While a grilled cheese is a staple item at Sonic, you can make it even better by adding ham to it. This is the greatness of the Sonic secret menu. The Grilled Ham and Cheese is so good that you won't ever want to go back to a plain grilled cheese. So order up big, because you can combine that cheesy goodness with a couple of slices of ham. You won't regret it! Be sure to check out the Sonic Secret Menu as well as visiting our home page to check out the complete list of All the Secret Menus from all your favorite restaurants!