While KFC Canada offers the stuff in plain sight, 'Muricans looking to climb aboard the gravy train will have to order off the books. Availability totally depends on the location's cheese curd supply, so you might wanna have a backup stash of curds, just to be safe.
Frito Pie (Sonic)
The cheesy pride of the South is available at Sonic to customers in the know. Pair it with the chain's other secret menu all-star, the surprisingly SFW Dr. Pepper Orgasm, for fast-food spy status.