Step 1

Grease and line base and sides of a 20cm square cake pan with baking paper.

Step 2

Melt chocolate in a medium heatproof bowl over a medium saucepan of simmering water, stirring occasionally.

Step 3

Meanwhile, combine marshmallows, biscuits and coconut in a large bowl. Add chocolate to marshmallow mixture and stir gently to combine. Spoon mixture into the prepared pan; tap pan on bench to settle mixture. Set aside until set.