In a bowl, mix the flour with the baking powder, baking soda, salt and chocolate drops.
Beat the eggs with the sugar until frothy. Melt the butter in a small saucepan. Peel the bananas and mash them with a fork. Stir butter, yogurt and bananas into the egg mixture. Carefully stir in the flour mixture until a viscous dough has formed.
Pour the batter into the molds and bake in the oven for about 25 minutes. Let the muffins cool down and then brush with the couverture heated in a water bath.
Dip a stick in the couverture and draw a mouth on 12 wafers and eyes on 12 other wafers.
Halve 12 wafers. Make a small cut in each of the muffins on the left and right and insert the half wafers.
Glue your eyes, then your mouth into the still warm couverture on the muffins.