Step 1

Preheat oven to 180°C. Brush a round 20cm (base measurement) cake pan with melted butter to grease. Line the base and side of the pan with non-stick baking paper.

Step 2

Place the butter, sugar, banana, eggs and vanilla in the bowl of a food processor, and process for 2 minutes or until well combined. Add the buttermilk and process until combined.

Step 3

Add the flour and bicarbonate of soda, and process until just combined. Pour the mixture into the prepared pan. Shake the pan to settle the mixture. Bake in oven for 1 hour or until a skewer inserted into the centre comes out clean. Set aside in the pan for 10 minutes to cool slightly, before transferring the cake to a wire rack to cool completely.

Step 4

Meanwhile, to make the cream cheese frosting, use an electric beater to beat the cream cheese and butter in a bowl until well combined. Add the icing sugar and beat until well combined. Add the buttermilk and beat until the mixture is pale and creamy.

Step 5

Place the cake on a serving plate. Spread the cream cheese frosting over the top of the cake.

Step 6

Peel and thinly slice the extra banana. Lightly brush 1 side of each slice of banana with lemon juice. Arrange the banana slices, lemon juice side up, around the edge of the frosting to serve.