Chocolate Mint Slice


  • 125g butter
  • 1 teaspoon vanilla extract
  • 4 tablespoons icing sugar
  • 1 3/4 cups flour
  • 2 tablespoons cocoa
  • 320g icing sugar
  • 1 tablespoon neutral flavoured oil eg rice bran oil
  • 1/4 cup milk
  • 1/2 teaspoon peppermint essence
  • 250 g dark chocolate


Preheat the oven to 180 C.
Beat the butter, vanilla and 4 tablespoons of icing sugar until pale and creamy. Add flour and cocoa, mix well. The mixture will be very crumbly but this is exactly as it should be. Press the mixture into a slice tin firmly until it has compressed, bake for 12-15 minutes or until firm to touch. Remove from the oven and sit until just warm.
Lift the base out from the tin and place on a wire rack.
Mix together the 320g of icing sugar, vegetable oil, milk and essence. Spread over the slightly warm base. Allow the icing to set until firm.
Gently melt the chocolate and add a few drops of oil, this helps to keep the chocolate shiny.  Drizzle the chocolate over the base (make sure the chocolate is not too hot) and spread until smooth.
Once the chocolate topping is firm then cut into pieces.
The base will be very hard but if you use a solid knife it should cut into perfect shapes.


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17 thoughts on “Chocolate Mint Slice

  1. Can anyone suggest why this did not work for me? Was like very fine crumbs when I pressed it into the tin and cracked and burnt in the oven straight away :( Really disappointing as followed recipe – something obviously not right??

    • I had the same issue! My tin isn’t too big, and I didn’t press the dough in too thin. I have tried it twice, and it seems like there isn’t enough butter in the recipe. Disappointing.

  2. At first I thought the base was a bit weird, not crunchy enough and determined to change it for a more conventional crunchy one (with coconut!). But this has been in the tin for 4 days now and it tastes exactly like Arnotts chocomint biscuits! AA Fabulous (am trying not to say awesome so much..). I added a bit of rice bran oil to the chocolate so it wouldn’t crack, but need a bit more i think. Great to have a peppermint filling that sets and doesn’t need Kremelta.