Preheat oven to 350 degrees.
Peel, core and thinly slice apples. Beat sugar and butter until crumbly.
Beat in egg. Beat in yogurt and vanilla.
Combine flour, ginger, baking powder, baking soda and salt;
fold into butter mixture alternately with apple sauce.
Spoon in lightly greased 9-inch springform pan.
Arrange apples in overlapping concentric circles on top.
Combine sugar, water and cinnamon; brush over apples.
Bake for 40 minutes or until cake tester comes out clean.
Let cool in pan on rack for 5 minutes. Remove side of pan;
let cool completely.