Peel the bananas and cut them in halves. Insert a lolly stick into each half, place on a tray, cover with cling-film and place in the freezer for about 3 hours (until frozen).
Finely chop the peanuts and place them in a shallow dish or on a plate. Break the chocolate into small chunks and melt in a heatproof bowl set over a saucepan of slightly simmering water. Make sure the water does not come into contact with the bottom of the bowl. Pour the melted chocolate into a tall glass then dip each frozen banana into the chocolate, turning it to coat, and immediately roll in the peanuts.
Place on a tray covered in greaseproof (waxed) paper to allow the chocolate to set. As soon as the chocolate is set, liberally apply finished bananas to face!