Preheat oven to 400 F.
Sift together flour, baking powder, salt and spices. Stir in apple, brown sugar and nuts.
In a separate bowl, combine eggs, juice and butter. Stir into apple mixture just until blended.
Fold in bran flakes.
Pour into oiled muffin pans, filling each cup about 2/3 full.
Bake at 400 degrees for 15-20 minutes.