Banana Cake with Peanut Butter Icing

HOLY MILLIE. (photo by Clare)

I made this cake for a peanut-butter-loving friend’s birthday the other week. It went down an absolute treat and people have been asking me for the recipe ever since. Thankfully I’ve finally got around to typing it up so I hope you all enjoy it! It’s incredibly easy to make. If you able to, I advise puréeing the bananas rather than mashing them as it results in a lighter more even sponge.


  • 200g light brown soft sugar
  • 200g unsalted butter, softened
  • ½ tsp vanilla bean paste
  • 3 large eggs, lightly beaten
  • 200g self-raising flour
  • 2 large ripe bananas

for the icing

  • 75g unsalted butter, softened
  • 75g smooth peanut butter
  • 150g icing sugar
  • 1/2 tsp vanilla bean extract
  • 10ml milk


  1. Preheat the oven to Fan 170°C and grease and line your cake tin. I used a 22cm heart-shaped tin from Squires which is available here.
  2. Blitz the bananas in a food processor to a purée and set aside. (Alternatively you could do this by hand with a fork)
  3. In a mixer fitted with a paddle attachment, cream together the sugar, butter and vanilla bean paste for about 5 minutes until pale and fluffy.
  4. Slowly add the eggs and keep mixing until they are all incorporated.
  5. Gently fold through the flour and finally fold through the banana purée.
  6. Pour the batter into the prepared tin and place in the preheated oven.
  7. The baking time will vary depending on the size of tin. I baked the one pictured for 50 minutes in a 22cm heart-shaped tin.
  8. Once the cake is lightly brown, well risen and a skewer inserted into the middle comes out clean, remove it from the oven and place on a cooling rack.
  9. Leave to cool for 10 minutes before removing the cake from the tin and placing back on the cooling rack to cool completely.
  10. Meanwhile, make the buttercream by creaming together the butter, peanut butter, icing sugar and vanilla until pale and fluffy. Gradually add the milk and continue to beat until the buttercream is nice and soft.
  11. Once the cake has cooled, slice it in half horizontally. Spread half of the buttercream on the bottom half before replacing the top and spreading with the remaining buttercream.


For more cakey recipes and inspiration check out