Add peeled banana, oats and milk in a blender and blend to make a smooth batter.
Take out the batter in a large bowl and add yogurt, honey, oil, baking powder, cinnamon powder and salt into it.
Allow the batter to stand for 10-12 minutes until it thicken slightly. Check the consistency of the batter. The batter should be free flowing when dropped from a ladle. Add a little milk if the batter becomes too thick.
Finely chop all the nuts. I have used a mix of cashew nuts, almonds and walnuts.
Brush the sandwich maker with little oil and pre-heat it for 5 minutes.
Fill all the triangular wells of sandwich maker with the batter leaving a little space to let it expand.
Sprinkle the chopped nuts and sesame over it and close the lid and let it cook till the green light is on or for 3-4 minutes.