Birthday party giant Rice Krispie cake recipe

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Our giant rice krispie cake is a no bake celebration cake that is perfect for kids' parties! This is a great way to get kids involved in the kitchen too!

Preparation Time20 mins plus chilling
Cooking Time5 mins
Total Time25 mins plus chilling
Cost RangeCheap

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. Much easier to make than a classic chocolate cake, this no-bake giant Rice Krispie cake 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




  1. 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.
  2. Add the marshmallows and warm through for 2 mins. Mix vigorously to combine everything together.
  3. Slowly tip in the Rice Krispies and mix everything together until it is all well coated in toffee mixture.
  4. 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.
  5. 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.
  6. 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.
  7. 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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