Good old fashioned quick recipe which will take you 30 minutes from start to eating
Beat the egg , melted butter, milk and boiling water, and mustard (if using, but if using cayenne pepper add this to the dry ingredients)
Sieve the flour, salt and baking powder and add to the grated cheese.
Mix the wet ingredients into the dry ingredients .
Spoon into 6 small greased muffin or cupcake cups and (sprinkle a little cheese over it top if you like, but not necessary) and bake at 200ºC / 400ºF for 12-15 minutes.