Preheat oven to Gas 4, 180ºC, fan 160ºC. Line a bun tin with 12 cupcake cases.
In a mixing bowl, cream Everyday Value butter and sugar until fluffy. Gradually beat in the Everyday Value eggs until mixture is smooth. Fold in Everyday Value flour, baking powder and Everyday Value bananas.
Divide between cases and bake for 20-25 minutes. Cool. Can be stored for up to 3-4 days.