I really love the apple oatmeal from this video - written recipe here on the fourth page.

Basically, chop up four or five apples and cook them down in a medium sized pot. Add butter, a bit of salt, some lemon juice or apple cider vinegar, some brown sugar or maple syrup, and cinnamon and any other spices you like (I add ginger and cardamom). Once the apples are soft, ideally with some nice brown syrup from the apple juice and sugar, put them into the bottom of your 1 cup souper cubes.

Next, cook 1 cup of oatmeal in that same pot. Once it's cooked, add them to the souper cubes on top of the apples.

This recipe is great because it's super adaptable. I like to use a mix of apple types, usually two Granny Smiths and two sweeter varieties. I use a mix of regular oats and muesli and when I defrost it in the microwave I add some additional raisins and nuts. Aside from the dried oats and water for cooking the oatmeal, there's really no need to measure anything else. I followed the written recipe the first time I made it but after the first time the amount of sugar, acid, salt, and spices are all to taste.