Step 1

Heat the oven to 180C/160C fan/gas Line a muffin tin with six muffin cases. Sieve the flour, cocoa and baking powder into a medium bowl. Mix together the egg, sugar, oil and milk together in a jug, then gradually pour into the dry ingredients (add chocolate chips now to make double chocolate muffins, if you like) and mix until combined.

Step 2

Spoon the mixture evenly into the cake cases and bake for 20-25 mins until a skewer inserted into the middle comes out clean. Remove from the oven and leave to cool.

Step 3

Meanwhile, gradually mix ½-1 tbsp water into the icing sugar until you have a loose consistency that's not too runny. Drizzle the icing over the muffins once cool.