Step 1
Preheat oven to 160°C/140°C fan forced. Grease a 20 x 30cm slice pan. Line the base and sides with baking paper, allowing the paper to overhang the sides.
Step 2
Place the butter, sugar, white chocolate, water and golden syrup in a large saucepan over low heat. Cook, stirring occasionally, for 5 minutes or until smooth and combined. Remove from heat and set aside for 5 minutes to cool.
Step 3
Add plain and self-raising flours to the golden syrup mixture. Stir until smooth. Add eggs, 1 at a time, stirring, until combined then pour into prepared pan.
Step 4
Finely chop 4 Snickers Fun Size chocolate bars. Scatter over mixture. Bake for 25 minutes or until a skewer inserted into the centre comes out clean. Set aside in pan to cool.
Step 5
Meanwhile, combine the dark chocolate and cream in a microwave-safe bowl. Microwave on High, stirring every 30 seconds, until smooth. Place in the fridge, stirring occasionally, for 30 minutes or until chilled, thick and glossy.
Step 6
Spread choc mixture over cake layer. Arrange remaining Snickers on top. Drizzle over caramel. Sprinkle with nuts. Set aside to set before slicing.