Soft cinnamon apples top a tangy, moist cake flavored with applesauce and yogurt.

Notes:I like to use soft, tart, baking apples such as Gala or Cortland. I find Granny Smiths, though tart, are too hard and don't soften properly on top of the cake. For the topping, the butter should be soft enough to spread easily over the apples with a brush.