In your food processor, grind the walnuts and 3/4 cup (67 grams) rolled oats until there are no more large chunks and then set aside. Add the dates and raisins to the food processor and process until it's smooth, and then add the vanilla and cinnamon.

Process until thoroughly combined and then add the oat and nut mixture. Pulse. At this point, you can start adding oat bran and the remaining rolled oats.

Add 1/4 cup of each, pulse, see if you like the consistency, and if you want even more bran and oats, add more, a little at a time. You don't want them to get too dry.

Roll tightly into balls. You'll have to squeeze them together to get them to stick, but it'll work.

For the frosting, stir everything together and pipe onto the balls or just spoon a little bit over. These are already pretty sweet so you might not want it.

Store in an airtight container for up to 3 days or refrigerate for up 1 week.