Q:

How to order an individiual item instead of a set?

I say 「セット」 when I order a set, and I say 「これだけ」 when I just want to order an individual item.
Is there any common way to order an individual item instead of a set?

A:

You can use 単品【たんぴん】. Perhaps this is the only word you would need in this situation.

チーズバーガー、単品で。  
単品のチーズバーガーを2つ。  

