We baked up a huge batch of steel cut oats to freeze in muffin papers so they would be pre-portioned whenever needed. We did this to keep in the freezer at the little guy's preschool (the teacher gives him his special muffins whenever they serve a snack with sugar in it). He chose oatmeal over classic "muffins," so I was more than happy to oblige.
First we soaked the oats in water and a splash of apple cider vinegar overnight. You could also use lemon juice or whey.
The little guy organized the muffin cups and papers and we portioned it all out. You can see we used some odd shapes for the ones at home.
Then we left them on the counter to harden for a couple of hours, then transferred into plastic bags and into the freezer.