Birthday party giant rice krispie cake recipe

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20 min


5 min

Our giant rice krispie cake takes a childhood baking classic and turns it into a two tiered cake, ready to share with friends and family. This no-bake giant rice krispie cake is so easy to make and is a fun addition to any kids’ birthday party. You can personalize this giant rice krispie cake by using your favourite chocolates and sweets to decorate.


  • For the basic recipe:
  • 2 x 227g packets dairy toffees
  • 250g butter or olive oil spread
  • 2 x 200g packet marshmallows
  • 350g Rice Krispies
  • For the Mars Bar sauce:
  • 2 Mars bars, sliced
  • 4tbsp double cream
  • To decorate:
  • 120g packet giant white chocolate buttons
  • 150g packet mini marshmallows
  • You will need:
  • 20cm and 15cm deep cake tins, greased and lined


  • Unwrap the toffees and put them in a large non-stick pan with the butter or spread. Heat gently for several mins until the butter has completely melted, then stir quickly to combine with the melting toffees.

  • Add the marshmallows and warm through for 2 mins. Mix vigorously to combine everything together.

  • Slowly tip in the Rice Krispies and mix everything together until it is all well coated in toffee mixture.

  • Quickly spoon the mixture into both tins. Use a wooden spoon and push down firmly into the corners, to level the surface. Chill for at least 1 hour.

  • To make the sauce, heat the Mars bars and cream in a small non-stick pan and stir together to create a smooth chocolate sauce.

  • Put the larger cake on to a cake stand. Drizzle some sauce over the top and sides of the larger cake. Press the small cake on top and drizzle the top and sides with more chocolate sauce.

  • Press on white chocolate buttons, and the mini marshmallows. To serve, lift off individual layers of cake and cut into portions.

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