(click on the text to highlight each stage):

1. Set the oven to 170°C, 150°C fan, gas 5. Line a muffin tin with large paper cupcake cases
2. Place the butter and muscovado sugar in a mixing bowl and beat until light and fluffy. gradually add the beaten egg a little at a time until smooth. Using a large metal spoon fold in the flour, cocoa, vanilla and baking powder and chocolate chips
3. Divide the mixture between the cupcake cases
4. Bake for 20 -25 minutes until risen and just firm to the touch. Allow to cool
5. To make the icing, beat the cream cheese, vanilla, icing sugar and cocoa together until smooth then swirl or pipe onto the cupcakes