Skip to main content
Chocolate Surprise Cake
120Total Time
50Prep Time
30Bake Time
A challenge

Chocolate Surprise Cake

42 Reviews

  • Nut Free
  • Vegetarian

About this Surprise Cake

Just imagine the delight on your guests face when you take your first slice into this delicious chocolate cake, bursting with smarties - or whatever you fancy stuffing inside! Reece's pieces? M&M's? Skittles? You can make this Chocolate Surprise Cake exactly how you like it!

120Total Time
50Prep Time
30Bake Time
A challenge


  1. Step 1:

    Preheat the oven to 180°C (fan 160°C, gas mark 4). Grease and line three 8” circular cake tins.

  2. Step 2:

    Cream together the butter and sugar until light and fluffy.

  3. Step 3:

    Gradually add the eggs one by one, mixing in between.

  4. Step 4:

    Sift in the flour and baking powder and fold in.

  5. Step 5:

    In a separate small bowl mix together the cocoa powder and boiling water to a paste then add to the mixture, stirring to combine.

  6. Step 6:

    Once fully combined, carefully pour into the 3 prepared tins in equal measures.

  7. Step 7:

    Bake the sponges in the oven for 25-30 minutes or until a skewer comes out clean when inserted in the centre of the cake.

  8. Step 8:

    Once baked, leave the sponges to cool on a wire rack.

  9. Step 9:

    Once fully cooled, carefully cut out a large circle from the centre of two of the sponges using a pastry cutter, these will become the bottom and middle sponges.

  10. Step 10:

    Place the bottom base on a cake board or cake stand that you want to present your cake on (it will be difficult to move once filled).

  11. Step 11:

    Beat together the icing sugar, cocoa powder and butter to make your buttercream (you may need to add a splash of milk to loosen up).

  12. Step 12:

    Spread a thin layer of buttercream on the bottom layer of your cake (not covering the hole) and place the second layer on top.

  13. Step 13:

    Fill the hole in the centre with your chocolate sweets.

  14. Step 14:

    Spread a thin layer of buttercream on the top of the sponge and place the remaining sponge layer without the hole on top to seal in the sweets.

  15. Step 15:

    With the remaining buttercream spread generously on the outside of the cake (or pipe if preferred).

  16. Step 16:

    Decorate with chocolate sprinkles and serve.


  • For the Cake

    • 260g Unsalted butter (softened)
    • 260g Billington's Unrefined Dark Muscovado Sugar
    • 5 Free range medium eggs
    • 260g Allinson's Self-Raising White Flour
    • 2.5 tsp Baking powder
    • 8 tbsp Boiling water
    • 60g Cocoa powder
  • For the Buttercream

    • 500g Silver Spoon Icing Sugar
    • 40g Cocoa powder
    • 300g Unsalted butter (softened)
    • 2 tbsp Milk
  • For the Filling

    • 200g Chocolate sweets (smarties or m&ms)


  • 3x baking tin 8in

Nutritional Information

per 150g
  • 709cal Energy
  • 39g Fat
  • 24g of which Saturates
  • 79g Carbohydrates
  • 64g of which Sugars
  • 7.4g Protein
  • 0.57g Salt

Great recipes and more at

Exclusive gifts and kits to take your baking to the next level Competitions and baker of the month prizes More than 1,000 recipes to try.