Melt butter in a fry pan,stir well and saute it for 3-4 minutes.Sprinkle sugar and salt ,saute it again and mash the banana pieces very well.Keep it aside.
Take bread slices ,cut the edges from all sides.Roll them flat using chapathi roller.
Now apply peanut butter and banana mix to each bread slices.
Roll them like a sandwich.Keep it in the fridge for 5 minutes.
Pinwheel sandwich is ready.Serve with a cup of coffee or tea.