Grease and line with baking paper, a 20cm round springform baking pan.
In a heat-proof bowl, add butter, white chocolate, caster sugar & milk and melt over low heat. Stir until fully combined. Remove from heat and set aside for 15 minutes to cool.
In a separate large mixing bowl add plain flour & self-raising flour and stir to mix..
Add warm butter & chocolate mixture and egg. Using a spoon or spatula, stir to mix through and fully combine.
Add 250g Frozen raspberry (reserve 50g) and stir to mix through. Note: Use raspberries straight out of freezer to minimise any raspberry bleeding into the cake mixture.
Place into oven and cook for about 80 minutes or so, or until a skewer inserted into the centre of the cake comes out clean.
Remove from oven and cool in baking pan for about 10 minutes before turning out onto a wire rack to cool completely.
White Chocolate Ganache
In a small heatproof bowl add cream & white chocolate. Melt and stir until fully combined and smooth.
Place in refrigerator for about 60 minutes until chilled and thickened.
Remove from refrigerator and beat using an electric mixer until soft and creamy.
Spread ganache over top and side of the cake.
Top with remaining raspberries and sprinkle with chopped peanuts.