1.Preheat a jaffle or sandwich maker.
2.Spread one side of each bread slice with butter.
3.Stir almond butter, cacao and syrup in a small bowl until smooth.
4.Place two slices of bread buttered-side-down on a board; spread half the almond butter mixture on each slice, then top with banana, leaving a 1cm border. Top with remaining bread slices, buttered-side-up.
5.Cook sandwiches in jaffle maker for 5 minutes or until golden. Serve cut in half, dusted with cinnamon.