Preheat a Jaffle maker.
Spread one side of the 6 slices of bread with butter.
Spread the other side of each slice with Nutella, Cashew butter and honey respectively.
Place 2 slices of bread, butter-side down, in the maker. Add in the banana. Top with remaining bread, butter side-up.
Cook for 1-2 minutes or until golden.
Set aside to cool.
Slightly cut into halves to serve.