From the perspective of an American, chips or crisps are a common side for lunch foods, particularly for sandwiches. In fancier restaurants / cafes, they can be fancier "kettle chips" which can also be house made.

I know fancy "crisps" may not make much sense outside of America, but we have taken thinly slice fried potatoes to a gourmet level here.

Edit- also, tortilla chips are also a common side in southern California, and they are not at all like anything you can get overseas without really looking. And no, I'm not talking about Tostitos style chips that are used for shitty dips.