Chocolate and mint marshmallow slice




Prep Time


Cook Time

The timeless combo of mint and chocolate is enhanced by the textures of a buttery cake base and puffy marshmallow filling.



For the base

  • 125g butter — softened
  • ½ cup sugar
  • ½ teaspoon vanilla extract
  • 1 cup flour
  • ¼ cup cocoa powder
  • 1 teaspoon baking powder
  • 200g chocolate
  • 1 tablespoon oil

For the mint marshmallow

  • 1 cup cold water
  • 2 tablespoons gelatine
  • 1 cup sugar
  • 2 tablespoons lemon juice
  • 1 cup icing sugar
  • ½ teaspoon peppermint essence
  • A few drops of green food colouring


For the chocolate and mint marshmallow slice

  • Preheat the oven to 180°C (160°C fan bake). Line a 28 x 18cm slice tin with baking paper.
  • To make the base, cream the butter and sugar until light and fluffy. Add the vanilla.
  • Whisk the flour, cocoa and baking powder in a separate bowl, then fold into the butter mixture.
  • Press into the prepared tin and bake for 18–20 minutes until the base has slightly risen. Leave to cool.
  • To make the Mint Marshmallow, place the water in a large saucepan. Sprinkle the gelatine over the top and set aside for 5 minutes.
  • Add the sugar and lemon juice and stir over a low heat until the sugar has dissolved.
  • Bring to the boil, then continue to boil for 8 minutes without stirring. Remove from the heat and set aside for about 20 minutes until lukewarm.
  • Add the icing sugar and peppermint essence and beat with an electric beater for about 5 minutes or until the marshmallow is glossy and thick.
  • Beat in the green food colouring a drop at a time until your desired colour is achieved.
  • Spread the marshmallow evenly over the base. Set aside to set.
  • To make the chocolate topping, break the chocolate into a microwave-safe dish, add the oil and microwave for 1 minute. Stir, then microwave in 20-second bursts, stirring between bursts, until melted and smooth.
  • Spread over the marshmallow and leave to set.
  • Cut into 16 pieces using a hot knife (this will stop the chocolate from cracking).