Lower the oven rack to next to lowest position. Preheat the oven to 350 degrees
Grease and flour a bundt pan. We used a 10 cup bundt that holds 6 cups of batter.
Dice apples. We used 2 cups of diced apples (from 2 large granny smith apples.)
In the mixing bowl, add the cake mix, all purpose flour, brown sugar and spices. Whisk to blend.
Add the vegetable oil, eggs, vanilla extract, and buttermilk.
Mix for one minute on medium speed. Pause to scrape down the bottom and sides of the bowl with rubber spatula. Then mix one minute more one medium speed.
Fold in the diced apples and pour into the prepared bundt pan.
Bake at 350 degree for 40 minutes or until a long skewer comes out clean or with just a few crumbs attached.
Keep an eye on the cake, you may need to lightly place a piece of aluminum foil on top of the cake if you notice it become too brown after around 20 minutes.
Allow the cake to cool on a wire rack in the pan for about 10 minutes. Then turn out.