01 -
Combine dark chocolate, milk chocolate, and unsalted butter in a saucepan over low heat. Stir continuously until fully melted and smooth.
02 -
Remove from heat and allow the chocolate mixture to cool slightly for several minutes to prevent melting the add-ins.
03 -
Stir in mini marshmallows, chopped nuts, dried cranberries, and crushed biscuits, ensuring all components are evenly coated in chocolate.
04 -
Line a baking dish with parchment or greaseproof paper to facilitate easy removal of the set dessert.
05 -
Pour the rocky road mixture into the prepared dish and spread evenly using a spatula.
06 -
Refrigerate the dish for at least 2 hours until firm and fully set.
07 -
Lift the set rocky road slab from the dish using the lining paper, cut into squares, and serve.