I like to call this sweet treat the Apple Mystery Dessert because, well, it's a little hard to categorize what it actually is. It could be cake, pudding, or a pie. But don't let that scare you off; regardless of its mysteriousness, it is wonderfully delicious. (:
In a large bowl, mix together flour, brown sugar, baking powder, salt, mace, and cinnamon. Stir in vanilla and eggs and blend well. Add apples and walnuts, mix well. Pour into greased 9 inch pie pan.
Bake at 350 degrees for about 25 minutes or until the sides and top are brown and firm to the touch.