Preheat oven to 190°C/fan 170°C/gas mark 5.
Cream together the sugar and butter in a bowl.
Add the Fate Low Protein All-Purpose Mix, egg replacer and baking powder and mix until combined.
In a separate bowl, add the coffee to the ProZero and mix well, then add the egg replacer and vanilla essence.
Add the ProZero mixture to the dry mixture and mix until well combined.
Spoon the mixture evenly into the cupcake cases.
Bake in the oven on the middle tray for 25 minutes.
Decorate with the icing to taste.
Fate Low Protein All-Purpose Mix and ProZero are foods for special medical purposes and must be used under medical supervision.