Preheat the oven to gas mark 4 or 180 degrees celsius.
In a large bowl, beat together the butter, oil and sugar until it forms a smooth paste.
Gradually fold in the buttermilk, egg, flour and cocoa powder until it forms a smooth cake mixture.
Add the red food colouring until you have a rich red cake mixture.
Line a muffin tin with 12 cupcake cases. Fill each case with the cake mixture until they are filled around halfway. Use the mixture evenly across all 12 cases. Bake for 15-20 minutes, or until a cake tester can be removed cleanly.
Leave cupcakes to cool on a wire rack and prepare the cream cheese frosting.
Mix together the cream cheese, butter and icing sugar until it has a thick consistency. Insert into a piping bag with a round nozzle.
Once the cakes are cool, you need to take the crust off of the top of the cake. Remove a 1p sized circle from the centre using a sharp knife. This will be used as the crumbs to place on the top!
Pipe the cream cheese onto the top of your cake (I just piped into the centre until if formed a neat blob!) and sprinkle the crumbs you have leftover (they may need rubbing between your thumb/finger to make them smaller). Place in the fridge to allow the cream cheese to set slightly and enjoy!