The deal is good for single-patty cheeseburger only and add-ons cost extra. There doesn't appear to be a limit as far as the fine print goes this time around (although it might just vary from location to location).
A Sonic Cheeseburger features American cheese, crinkle-cut pickles, chopped onions, shredded lettuce, and sliced tomatoes on a beef patty with your choice of mustard, mayo or ketchup (you can check out my previous review of one here). They normally go for about $3.50 (may vary).
Photo via Sonic.
