Preheat the oven to 200°C/400°F/Gas mark 6. Lightly
grease 12 muffin pans.
Sift the flour, cocoa powder and
bicarbonate of soda into a bowl and add the sugar. Make
a well in the centre.
In a jug, whisk the buttermilk and
eggs together and pour into the well. Add the butter and
fold gently with a metal spoon until just combined. Fill
each pan about three-quarters full.
Bake for 20 to 25
minutes, or until the muffins are risen. Allow to cool
for a 2 minutes and transfer to a wire rack to cool.