I was at my mom's house this morning and she was making this for dinner. I will be making this tomorrow. She has a 6 quart crock pot, so that is what this recipe is for.
Cube enough potatoes to fill your crock pot just over half way. Rinse them off so your soup isn't too starchy. Put the potatoes in the crock pot. Add one diced onion and the can of corn - juice included. Let this cook in the crock pot until it's boiling pretty well, then turn to low. Mom didn't start this until around noon, so she put the potato/corn/onion mix in the microwave to heat up. Then the crock pot just starts cooking without having to heat up the food first.
This is great served with some crusty bread, a salad, or by itself.