Preheat the oven to 200 degrees C; Grease the muffin tray or insert paper liners. Cut the ham into small cubes. Melt the butter. Sift the flour and baking powder into a bowl, mix in the nutmeg, cheese and ham. In a small bowl, mix the egg, milk and cooled butter together well. Carefully fold this mixture into the flour mixture. Pour the mixture into the molds with a tablespoon. Bake the muffins for 15-20 minutes on the middle rack (fan only 180 degrees) until golden brown. Possibly sprinkle a few cheese sprinkles on the muffins after baking for 8 minutes. Remove from the oven and then let rest in the tin for 5 minutes, only then release. Serve - done.