Jack In The BoxAdditional Cheese SlicesCheeseJust ask for an extra cheese slice or two (or 10) on your Burger.All Locations3 - Medium-Low$0.40 per slicehttp://hackthemenu.com/jack-in-the-box/secret-menu/additional-cheese-slices/Welcome. If you're addicted to cheese, then Jack In the Box will let you order " Additional Cheese Slices " by simply asking for it to be added to your sandwich or hamburger. The same can be said for bacon as well, so you can pretty much load up your burger into anything you want. As with other menu modifications, this may result in a higher price. You'll be charged for the extras. But hey, this kind of stuff is what makes the burgers so great. Be sure to check out the Jack In The Box 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!