Step 1

Preheat oven to 200°C. Line twelve 80ml (1/3-cup) capacity muffin pans with paper cases.

Step 2

Sift the flour and baking powder into a large bowl. Add the Weet-Bix, sugar and sultanas, and stir until combined. Make a well in the centre.

Step 3

Combine banana, buttermilk, melted butter and egg in a jug. Add to flour mixture and fold until just combined (do not overmix). Spoon into prepared pans.

Step 4

Get a grown-up to: Bake in oven for 18-20 minutes or until a skewer inserted into the centres comes out clean. Transfer to a wire rack to cool.

Step 5

Use an electric beater to beat together cream cheese, icing sugar and lemon juice until light and fluffy. Spread frosting evenly over the cooled muffins.