Turn oven onto 180° and line/spray a muffin tray.
Blend oats in the blender until they are a fine powder.
Add the rest of the ingredients except for the walnuts and dates.
Blend together until well combined. It should be thick but still runny. If it is too dry, add a dash of juice/milk.
Then add walnuts and dates (optional) and mix with a spoon.
Spoon into muffin tray and place into the oven.
Bake for 15-18 minutes. They should bounce back when lightly touched.
Allow to cool for 5 minutes in the tray before transferring to a cooling rack.