In a mixing bowl, combine the topping ingredients, mix well and set aside.
Preheat oven to 350 degrees.
In a large mixing bowl, combine flour, sugar, baking powder,
baking soda, salt, cinnamon and nutmeg.
Beat eggs, sour cream, and melted shortening in a small bowl.
Stir into dry ingredients and mix just until blended. Stir in apple.
Spread evenly in a greased 9-inch-square pan. Sprinkle topping over batter.
Bake for 45 to 50 minutes. Serve warm or at room temperature.