Plenty of dining options cluster in Mammoth Lakes [1]. You can get your fast-food cheeseburger and your chain double-latte here, but why would you with so many more interesting independent options just lying around? Fare runs to American food and pizza, with a few ethnic options thrown in for variety.
Links:
[1] http://www.moon.com/destinations/california/yosemite-and-the-eastern-sierra/mammoth-lakes