Lightly coat a 9-inch baking pan with cooking spray; set aside.
In a medium bowl combine the 2/3 cup flour, 1/2 cup whole flour, soda, 1 teaspoon cinnamon, and salt, set aside.
In a large mixing bowl toss together the chopped apple and egg product; stir in the 3/4 cup sugar, the 1/4 cup nuts and applesauce;Add flourmixture and stir JUST until combined.
Pour batter into prepared pan; For TOPPING, stir together the brown sugar the remaining flour, whole wheat flour and cinnamon; Cut in butter until crumbly, stir in remaining nuts, sprinkle topping over batter in pan.
Bake in 350 degree oven 30 to 35 minutes or until a toothpick comes out clean; cool in pan for 10 minutes, serve warm.