How to stop oatmeal from sticking to the sides of my slow cooker?
Are you cooking too long or too hot?

Oats shouldn't burn; stuck oats should just soak off.

Crock Pot Tips:


Often the slow cooker's ceramic pot gets quite rough and can have cracks in the glaze. Try an oven proof glass pot inside the ceramic pot (or instead of it if it fits OK).
A hardware-store drill-speed-controller, or heater thermostat/controllers, can be used on slow cookers to reduce their heat. Also, a plugin timer can be used to time the cooking cycle.


Different Methods:


You can bring the oats to the boil and pour into a preheated thermos flask (with a wide opening) and leave overnight. Traditional oats or other grains were brought to the boil on the evening fire, and then the  pot was put into a hay box* for breakfast and lunch the next day
Personally I cannot tell much difference between slow cooker oats and a serving of oats that were blasted in the microwave for three minutes. Just compensate with a little extra milk, and let stand five minutes before serving


* Large wooden box lined with dry straw or hay, with a cavity big enough for the lidded cooking, pot. More hay and a heavy lid placed on top (to keep the animals out)