Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      cup           plain nonfat yogurt
   1      tsp.          baking soda
     1/4  cup           applesauce
   1      cup           brown sugar
   2                    egg whites
   1      tsp.          vanilla
   1 1/2  cups          all-purpose flour
   2      tsp.          baking powder
                        Topping
     1/2  cup           brown sugar
   1      tbsp.         cinnamon

Preparation:

Lightly coat a 9-inch baking pan with cooking spray. In small bowl, combine yogurt and baking soda: mix well and set aside. (mixture will grow in volume) In large mixing bowl, beat applesauce with sugar until well mixed. Add egg whites and vanilla: beat well, about 2 min. Combine flour with baking powder: add to applesauce mixture alternately with yogurt mixture. Topping: Combine sugar and cinnamon. Mix well. Spread half the batter in pan. Sprinkle with half the topping. Cover with remaining batter and sprinkle with remaining topping. Bake in 350F oven for 45 min or until toothpick inserted in center comes out clean. Let cool for 10 to 15 minutes in pan, then invert onto wire rack.