Place the chocolate in a heatproof bowl over simmering water and stir until melted and smooth.
Removed from heat, then add the coconut, macadamias and marshmallows; mix to combine.
Pour the mixture into an 11 x 7 tin lined with baking paper. Refrigerate for 2 hours or until set.
Remove from tin and cut into squares.
Submitted by: Krystal