Smarties Chocolate Birthday Cake

It’s been a whole year now since I was making a Frozen Birthday cake for my niece’s 4th Birthday! This weekend I was asked to make her Birthday cake again. I searched the internet fro something which looked fun for a kid but also didn’t take too much time (as I had an afternoon to get it done). I found this amazing, colourful looking Smarties cake, covered with chocolate finger and with a chocolate filling inside. The cake is truly a kids dream and looked like something that could be created in a few hours. This cake is not only perfect for a kids Birthday but would also work for big kids too!!

This cake is one of those which doesn’t take as much time as you would expect and is so easy to make look good! Even if you’re a messy or inexperienced baker this is a full proof cake. The chocolate fingers are an absolute dream at covering any messy sides or uneven sandwiching and the Smarties do exactly the same job on the top.

The sponge is a light, simple chocolate sponge which is nothing complicated and then all you need to make in chocolate buttercream. The rest is all down to assembling. I would do the chocolate fingers first and I used the leftover buttercream as an extra bit of glue to ensure they were securely on. The smarties you don’t have to be so careful with just make sure they’re touching the buttercream on the top. If you wanted to do something slightly different you could definitely do different variants of this cake, swapping smarties for M&Ms or Malteasers. Maybe even swapping the Chocolate fingers for Kit Kat fingers. You can adapt this to whoever you want it to suit!

I managed to make a start on this at 3pm and would happily say if I decorated the cake as soon as it was cool would have been done by 6pm. Therefore, this would easily make a last minute life saver as well!

Recipe was adapted and inspired by SundayBaking and Muminthemadhouse -be sure to check out their blogs!



Chocolate Sponge:

  • 80g Margarine
  • 280g Caster Sugar
  • 200g Plain Flour
  • 40g Cocoa Powder
  • 1 Tablespoon of Baking Powder
  • 240ml Milk
  • 2 Large Eggs


  • 400g Icing Sugar
  • 100g Cocoa Powder
  • 160g Margarine
  • 50ml Milk


  • 3 Packets of Chocolate Fingers
  • 6 Tubes of Smarties


  1. Line and Grease 2 8/9inch cake tins and pre heat the oven to 180 degrees
  2. In a large bowl put in the Margarine, sugar, flour, cocoa powder and baking powder. Mix together using a handheld electric whisk until the mix resembles sand/bread crumbs
  3. In a jug beat together the milk and eggs
  4. Add 2/3 of the egg mix into the dry ingredients and mix using the whisk at a slow speed. When combined add the remaining egg mix. As soon as its mixed stop beating to avoid over mixing
  5. Split the batter between the two cake tins and bake in the oven for 15-20 mins
  6. Leave to cool in the tins for a while before placing onto a wire rack
  7. Whilst the cake is cooling make the buttercream. Start by sieving the icing sugar and cocoa.
  8. Add in the milk and margarine and beat using a handheld electric whisk. Keep beating until smooth. Add in a little more milk if its looking a bit stuff to handle. If it’s too stiff it wont spread on the cake very well and will be a bit messy
  9. When the cake if fully cooled you can start assembling!
  10. Sandwich the two sponges together by putting a few tablespoons of buttercream on to the top of one sponge and spreading evenly using a spatula knife. Carefully place the second sponge on top- its fine if the buttercream spills over if anything this is what you want!
  11. Use the spatula knife to add some dollops of buttercream around the sponges and then smooth out to try neaten up and take off any excess. Remember we want a bit of thickness to the buttercream to allow the fingers to stick on!
  12. One by one stick your fingers around the edge, I added a little buttercream to the bottom of them to ensure they securely went onto the cake but you don’t have to do this!
  13. Once all the chocolate fingers are on crack open the Smarties and place them one by one onto the top of the cake until you’ve filled all the gaps!
  14. Finish the cake with candles for a birthday or even a bit of ribbon around it would look nice!





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