In a large bowl, combine flour, sugar, baking powder, baking soda, cinnamon, salt and nutmeg. In a separate bowl, mix together apple, egg, milk and butter. Add to dry ingredients and mix until just combined, but not overmixed.
Spoon into lightly greased or cupcake lined muffin tray until about 2/3 full.
Bake for 15-18 minutes or until golden and tops are firm to the touch.