Cook Quaker oats by boiling in liquid, typically water or milk. The cooking time varies with the method of cooking and the cut of the oats. Quaker oats features three types of cuts, steel, quick and old fashioned, as of 2015.
Quick oats are the thinnest cut and cook in boiling liquid in about one minute on the stove top or in a microwave. Old Fashioned style features thick cut rolled oats that cook the same as quick oats, but usually require about five minutes of cooking time. Steel Cut oats are the thickest and require 25 minutes on the stove top or seven to eight hours in a slow cooker.