Pre-heat oven to 180°C (conventional) or 160°C (fan)

Mix all of the dry ingredients in a bowl

Create a well in the centre of the dry mix and add the eggs

Mix until the eggs and dry ingredients together

Add the wet cake ingredients to the bowl and whisk until there are no lumps and it is fully combined

Line two cake tins/baking dishes with greaseproof paper

Pour the cake batter evenly between the two tins

Bake for 30-35 minutes (until light and golden)

Remove from the oven and allow to cool in the cake tins for about 20-30 minutes

Remove the sponge from the cake tins and allow to cool completely on a wire rack

In a bowl, beat together the icing sugar and butter until combined into a thick but smooth cream (this will take a few minutes)

Add in the vanilla extract and mix in well

Line a large tray and set aside

Crumble the vanilla sponge into a large mixing bowl (either using your hands or a food processor)

Add the buttercream to the sponge crumbs and mix together using a spoon until it is fully combined

Use a scoop to take portions of the cake truffle mixture and create balls using the palms of your hands

Place these, one by one, onto the lined tray

Pop into the fridge, for about 15 minutes, to set slightly (this makes them easier to handle when decorating but will not dry them out)

Melt the dark and milk chocolate and butter, in a bowl, using either a microwave (in short bursts, mixing intermittently) or using the Bain-Marie method

Add the cake truffle balls to the chocolate bowl and gently coat the entire surface using forks to move the ball around

Balance the coated truffle on one of the forks and gently shake any excess chocolate off and back into the bowl

Place the chocolate-coated truffle back onto the lined tray and repeat until all are coated

Pop the truffles in the fridge to set the first layer of chocolate (~10-15 minutes)

Melt the white chocolate in the way stated above

Take a spoon and drizzle the white chocolate over the top of the set truffles

Leave to set again then tuck in and enjoy!