Add banana, egg, oats, milk and cinnamon to a blender and blitz for about 1 minute, until smooth. Add a little more milk for a thinner batter if desired. Let sit for about 2 minutes.
Heat half the oil (or use butter) on medium heat and add about 3 tablespoons of mixture to pan for each pancake. Cook pancakes, in batches, for 2-3 minutes, until lots of bubbles begin to form. Flip and cook a further 2 minutes, until golden and cooked through. Use remaining oil for second batch.
Serve pancakes topped with yoghurt and berries.