Preheat oven to 150 degrees celsius (fan-forced). Grease and line the base and sides of a 20cm round cake tin with baking paper. Set aside.
Place the butter (chopped), brown sugar, milk and Caramilk chocolate (broken into pieces) into a microwave-safe bowl and melt on 50% power for 5 minutes or until melted (stirring every 30 seconds). Allow to cool slightly. Note: Alternatively, you can do this step in a saucepan on the stovetop.
Sift the plain flour and self-raising flour over the top and then add the vanilla extract, eggs and salt. Mix together until smooth.
Pour the mixture into the prepared cake tin. Bake for 60 minutes or until a skewer inserted into the middle comes out clean or with just a few moist crumbs on it. Allow the cake to cool before transferring to a wire rack or plate.
To make the Caramilk ganache, place the Caramilk chocolate (broken into pieces) and the thickened cream into a microwave-safe bowl. Melt on 50% power for 2 minutes or until the chocolate has melted. Stir until smooth. Place ganache into the fridge for 1-2 hours (stirring occasionally) until thickened.
Spread the Caramilk ganache over the top of the cake and serve.
Thermomix Method
Preheat oven to 150 degrees celsius (fan-forced). Grease and line the base and sides of a 20cm round cake tin with baking paper. Set aside.
Place the chopped butter, brown sugar, milk and Caramilk chocolate (broken into pieces) into the Thermomix bowl and melt for 4 minutes, 60 degrees, Speed 2 (or until melted and smooth).
Add the plain flour, self-raising flour and add the vanilla extract, eggs and salt and mix for 5 seconds, Speed 5. Scrape down the sides of the bowl and repeat for a further 5 seconds (or until smooth and combined). Pour the mixture into the prepared cake tin.
Bake for 60 minutes or until a skewer inserted into the middle comes out with just a few crumbs on it. Allow the cake to cool before transferring to a wire rack or plate.
To make the Caramilk ganache, place the Caramilk chocolate (broken into pieces) and the thickened cream into the Thermomix bowl. Melt for 3 minutes on 60 degrees, Speed 2 (or until the chocolate has melted). Stir until smooth. Place ganache into the fridge for 1-2 hours (stirring occasionally) until thickened.
Spread the Caramilk ganache over the top of the cake and serve.
Notes
Recipe Notes & Tips:
Caramilk substitute - Caramilk chocolate is not available in all countries. However, you can easily substitute it with any variety of caramelised white chocolate, or swap it entirely for white chocolate instead.
Store the Caramilk mud cake in an airtight container at room temperature for up to 1 week. Do not store the cake in the fridge as it will dry out.
You can freeze this cake for up to 3 months (either iced with ganache or left un-iced). Allow to defrost before consuming.
Test to see if your cake is cooked by inserting a skewer into the centre. If it comes out clean or with a few moist crumbs on it, it's ready.
If you notice your cake is browning too quickly, simply place a sheet of foil loosely over the top and continue baking.