Take 4 bread slices. Apply Nutella on 2 bread slices. Spread evenly.

Cut banana into slices. Assemble banana slices on top of nutella. Cover with other bread slice.

Take butter in a bowl, add brown sugar & mix it with the help of whisker. Till both mix properly.

Heat a non-stick pan, Apply this mixture on top of bread slice, spread evenly. Put sandwich on pan, roast for few seconds.

Apply butter mixture on top of sandwich, after few seconds flip the sandwich, roast for few seconds, transfer in a plate. Cut in triangular shape with the help of sharp knife.