• Prepare slice tin by lining with baking paper. Preheat oven to 180°C.

For the Base

• Melt the white chocolate in the microwave in a microwave safe bowl on 50% in 30 second intervals until melted.
• Add chocolate, butter, icing sugar, ground macadamia nuts and plain flour to a stand mixer. Mix on low speed until combined.
• Press into prepared tin and bake for 18 minutes. Allow to cool in the tin.

For the Topping

• Preheat oven to 160°C.
• In a saucepan heat the condensed milk and chocolate together until the chocolate has melted. Cool for 15 minutes.
• Add eggs, flour, shortbread biscuits and chopped macadamia nuts. Mix gently until well combined.
• Pour mixture over the base then sprinkle with extra macadamia nuts. Bake at 160°C for 40 minutes or until golden brown.
• Remove from the oven and cool completely in the refrigerator before slicing.