The butternut squash makes the cake really moist and the combination of vanilla, chocolate and squash is just amazing.
Split the mixture between the two bowls. Add the melted chocolate to the first half of the mixture. Split the vanilla pod length-ways and using a teaspoon, scoop out the seeds into the second half of the mixture.
My oven is a bit funny these days so last time I had to increase a bit the cooking time and cover the top with aluminium foil so as it would cook the cake inside without burning the top of it.