Start by pre-heating your oven to 180c/350f
Add the butter, oil, sugar and vanilla into a bowl and beat these together for 5 minutes on high speed. if you're doing this by hand, just beat it for as long as you can
Whisk in both the eggs, then add the flour and milk. mix until you get a smooth batter
Add this batter into your cupcake cases. typically you would fill cupcake cases ¾ of the way full, for these you want there to be room for the chocolate, so fill them a little less than half way
Bake these for 15-20 minutes, just until a toothpick comes out clean
Once they have baked and cooled down you can add the chocolate topping. to make it just add the chocolate and oil into a bowl and heat in the microwave, at 15 second intervals, until the chocolate has melted
Pour this over the cupcakes, you want the chocolate to reach the top of the cupcake liner
Let this set in the fridge and then enjoy!
