Costco membership, only eat from the food court.
No, its not the healthiest, but you could do worse, and uh... yeah, do the math on if you just only ate costco hot dogs and pizzas and such, 365 days a year, and that alone is well worth the yearly membership fee.
Maybe also buy some vegetables.
Frankly I'll be amazed if Costco can maintain their food court prices, I am pretty sure more and more people are just going to actually do something like this.