Preheat the oven to 170C, gas 5. Line a 12-hole deep muffin tray with paper muffin cases.
Sift together the flour, cocoa and baking powder. Stir in the sugar. Add the remaining ingredients and mix lightly together.
Spoon the mixture into the prepared cases. Bake for approximately 20 mins or until golden and springy to the touch. Cool for 10 mins; transfer to a wire rack and leave to cool completely.
