Apple Spice Cake

For the cake:

1 cup all-purpose flour

1 cup whole wheat pastry flour

1 ½ teaspoons baking powder

1 ½ teaspoons baking soda

1 ½ teaspoons ground cinnamon

½ teaspoon apple pie spice

½ teaspoon salt

¾ cup Splenda® Granulated Sweetener

½ cup canola oil

½ cup 1% lowfat milk

1 large egg, lightly beaten

1 tablespoon apple juice or apple cider

1 teaspoon vanilla extract

1 ½ cups chopped apple

½ cup chopped walnuts

For the topping:

1 cup whole wheat pastry flour

½ cup Splenda® Granulated Sweetener

1 teaspoon ground cinnamon

½ teaspoon baking powder

¼ cup canola oil

¼ cup chopped walnuts