Chocolate Marble Cakes
Heat the oven to 180°C (160° fan) 350°F gas 4. Place paper cases in a 12 hole bun tin.
Put the butter, sugar, flour, eggs and milk in a mixing bowl and whisk with an electric whisk for 1 minute. Alternatively beat with a wooden spoon for 2 minutes until well blended.
Divide the mixture between 2 bowls and stir the cocoa powder into one of the mixtures.
Spoon each mixture alternately into the paper cases and swirl lightly with a cocktail stick or skewer.
Bake for 20-25 minutes until risen and firm to the touch. Cool for 5 minutes in the tins, then place on a wire rack to cool completely.