Preheat the oven to 200C/400F/Gas Mark 6.
Line two Pyrex Muffin Tins with 12 small squares of greaseproof paper.
Sift the flour and baking powder into a large mixing bowl. Stir in the sugar & nuts.
In a separate bowl, whisk together the egg, milk, melted butter & coffee. Gently combine the two mixes together.
Divide the mixture between the Pyrex Muffin Tins.
Sprinkle over the Demerara sugar and bake in the oven 15-20 minutes.
Allow to cool before popping in your lunch box