Add all the ingredients to a tall jug and blitz with a stick blender until smooth. (You can use a food processor if you prefer). The mixture should be quite thick so that the pancakes hold their shape. If necessary add a few more oats. Or if the mixture looks too thick, you can add a little more milk.
Heat the oil in a pan. When hot, add tablespoons of the pancake mixture and spread out a little with the back of a spoon. Cook for 2-3 minutes until set. Then turn or flip, and cook the other side for 1-2 minutes.
It's best to cook the pancakes in 2 batches so that there is room to turn them.
Notes
If you want to make the pancake mixture by hand, it's best to use ready ground oat flour so you have a smoother mixture. Beat the egg in a bowl, and add in the oat flour, baking powder, milk and cinnamon if using.
You can use any kind of milk: diary or non dairy, skimmed or full fat