Smarties Marble Loaf Cake


This cake has been inspired by two things. My friend sent me a post on Instagram showing the most amazing smarties loaf cake then we got talking about buying a loaf tin to do a marble cake and all week I have been thinking about combining the two.

Marble cake is underrated in my opinion as the best of both. Chocolate swirled in with vanilla and it just a good combination.


This is just one mixture so there is no need to mess about making lots of cake mixtures. You just half the mixture and add your flavourings.

You can use any tin you like for this recipe, I decided my loaf tin because I don’t utilise my loaf tin enough and the loaf tin just works well when you coming to swirling the cake mixture together.


Now you can add topping you like to this cake but like I said I was inspired by a smarties loaf cake that  I saw and just know they would be great for this cake.

I use cocoa powder in this recipe but you can easily use melted chocolate if you prefer a real chocolate taste just be careful when mixing it together in your bowls.


Making this cake actually made me super happy and gave a me a new wave of inspiration that I have defiantly been missing recently.

Smarties Marble Loaf Cake

Course desserts
Cuisine British
Keyword Baking, Cakes
Prep Time 30 minutes
Cook Time 50 minutes
Total Time 1 hour 20 minutes
Servings 10 Slices



  • 200 g Butter
  • 200 g Caster Sugar
  • 300 g Self-Raising Flour
  • 4 Eggs
  • 2 tbsp Cocoa Powder
  • 1 tsp Vanilla Extract
  • 2 tbsp Whole Milk


  • 200 g Butter
  • 400 g Icing Sugar
  • 2 tbsp Cocoa Powder
  • 2 tsp Vanilla Extract
  • Smarties
  • Smarties Buttons Milk and White



  • Preheat the oven to 170°C/gas mark 3. Line a 30cm loaf tin with baking paper
  • Beat together the butter and sugar until pale and fluffy then add in the eggs until fully incorporated.
  • Gently fold in the flour then place separate the mix into a two bowls. In one bowl add the vanilla extract and mix then in the other bowl add the cocoa powder and mix.
  • Spoon in a of the vanilla batter into the lined tin and spread out evenly. Pour ½ of the chocolate mixture on top in a swirling motion then cover with the remaining vanilla mixture. then use a metal skewer to swirl the chocolate through the vanilla to create the marbled effect
  • Bake for 45–50 minutes, until a metal skewer inserted into the middle of the cake comes out clean.


  • Beat the butter until pale and fluffy then sieve in the icing sugar a bit at a time until fully incorporated.
  • Half the buttercream once it is fully incorporated, in one half add the cocoa powder and in the other half add the vanilla. Mix until fully incorporated.*
  • Add buttercreams to piping bags with star nozzles and pipe one line of chocolate buttercream then a line of vanilla buttercream until the whole cake is decorated.
  • Add the smarties and smarties buttons until your happy then enjoy.


*If your buttercreams are too stiff then add some whole milk until you get a soft but pliable buttercream. 

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