Preheat oven to 325°F. Lightly grease an 8x8-inch baking pan.
In a medium bowl mix all topping ingredients together, except flour, until smooth. Add flour and mix with a fork until crumbly. Set aside.
In a small bowl, combine filling ingredients. Set aside.
In a large bowl, whisk together all dry cake ingredients. Slowly add milk, sour cream, eggs and vanilla. Mix until smooth and no streaks remain. Fold apples into the batter.
Pour half of your batter into the prepared pan. Sprinkle with dry filling mixture. Pour remaining batter over the cinnamon mixture. Using a fork, break up topping into small pieces. Cover batter with chunky cinnamon crumb topping.
Bake for 70-75 minutes or until a cake tester comes out clean. Let cool completely in pan before slicing and serving.
Nutritional information is provided as a courtesy and is an estimate only. Nutrition information can vary for a variety of reasons. For the most accurate data, use your preferred nutrition calculator with the actual ingredients you used to make this recipe.
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