||you were asked the following -
"Can I prepare instant oatmeal(just add hot water) on shabbos? I belive it is precooked and dried. "
- Was your answer dependant on it being precooked?
According to Quaker Oats, they are not -
"Instant Quaker Oatmeal cuts the oats finer to cook faster...It can be easily prepared by just adding boiling water or by adding water and microwaving it for 90 seconds."