Peel the bananas, break into pieces, place in a bowl, mash with a fork. Add the sour single cream, mix together. , set aside. Rinse and dry the single cream pot, use as a measuring cup.
Place the butter in a bowl, whisk in the sugar and salt using the whisk attachment on a hand mixer. Add the eggs one at a time and continue to whisk until the mixture becomes lighter in colour. Mix in the mashed bananas. Mix the flour, coconut flakes and baking powder, fold into the mixture using a rubber spatula. Line the muffin tin with paper cases. Spoon the cake batter into the muffin cases.
Approx. 30 mins. in the centre of an oven preheated to 180°C. Remove from the oven, allow to cool slightly, remove from the tin, leave to cool completely on a rack.
Toast the coconut strips in a frying pan without any oil until golden brown, leave to cool. Place the butter in a bowl and add the icing sugar. Using the whisk on a hand mixer, beat for approx. 2 mins. until light and creamy. Stir in the cream cheese. Transfer the frosting to a piping bag with a serrated nozzle (approx. 10 mm in diameter) and pipe onto the cupcakes. Break the coconut strips into pieces, scatter on top, decorate with the sugar eggs.