Can the kids split a meal? If they can, then the food court would be a good choice. Take for instance, the chicken strips meal. It's about $5, you get 3 huge strips plus a ton of fries. Split that, and it's on par with what you'll pay for McD and you get better quality of chicken.
Or.. another way is to get a double cheeseburger/hamburger, add an extra bun, and split it that way. Each burger can have its own topping from the topping station.
The personal pizzas are also great for splitting. They're pretty big, even for my 6yr old.