Only our big slow cooker (6qt) has a timer so I mixed everything in a 1.5qt Corningware casserole dish and set that in the slow cooker to effectively bake the oatmeal. The slow cooker cooks for the set time and then holds the food on warm for several hours so in this case it held it on warm for about 2 hours, which probably contributed to the solidness.
1 cup steel cut oats
1 cup unsweetened applesauce
1 cup milk
1 cup water
2 tsp vanilla extract
1 tsp cinnamon
1/2 tsp nutmeg (I may reduce this to 1/4 tsp next time)
1/4 tsp salt
Mix it all up and cook on low for 8 hours.
If you are cooking direct in the crock you will probably want to coat the inside with cooking spray or butter, and possibly risk burning it unless you add more liquid. Normally you want four parts liquid to one part oats.
As I mentioned it turns out very solid, so you will have to work a bit to stir the spices that floated to the top back down into it when it's done. The oats end up nice and chewy and while I don't normally add milk to my oatmeal I did with this and it was very tasty with bit of milk and a drizzle of sugar free maple syrup over it. I honestly do not know if I will add more liquid next time I make it.
It's not very sweet, and there really isn't a detectable apple flavor. If you want more apple and you want it wetter try adding a second cup of apple sauce. If you don't want it much wetter try chopping up some dried apples to stir in, though you might need a bit more water with that just because it does turn out so dry as it is.
Future experiments may involve other dried fruits.
6/13 - Tried it with an additional cup of applesauce, without reducing the milk or water. There is more apple flavor of course but it makes the oatmeal too wet for my taste. If you prefer creamier oatmeal over chewier oatmeal by all means go for the extra applesauce but I will stick to less liquid for myself.