• Pre-heat the oven to 160C / 320F.
• Line an 8-inch cake tin with baking paper.
• Place the bananas and vanilla extract into the Thermomix bowl. Mix together for 5 seconds / speed 5. Transfer to another bowl and set aside.
• Add butter and sugar to the Thermomix bowl. Mix for 30 seconds / speed 5.
• Add the eggs and mashed banana mixture to the bowl. Mix for 10 seconds / speed 4.
• Add the flour, baking powder and bicarbonate of soda to the bowl. Mix for 20 seconds / speed 5.
• Pour the mixture into the prepared cake tin.
• Bake in the oven for 45 minutes, or until a knife comes away clean when inserted into the middle of the cake.
• Remove from the tin and allow to cool on a wire rack. Ensure it is completely cool before adding the frosting.

For the cream cheese frosting

• Add the icing sugar to the Thermomix bowl. Mill for 10 seconds / speed 9. This ensures there are no lumps and you have smooth frosting.
• Add the butter, cream cheese and vanilla extract. MIx for 30 seconds / speed 5.
• Use a palate knife to smoother the frosting over the cake before cutting and serving.