Preheat oven according to cake mix package directions. Make the batter per directions on back of package. (To make the cake bakery style, substitute melted butter for the oil and substitute milk for the water.
Using a fork combine the four ingredients needed for the streusel.
Spray a 9x13 baking dish with a non-stick cooking spray. Lightly coat with flour. Pour half of the cake batter and evenly spread in bottom of baking dish. Evenly place the apple pie filling over the cake batter. Pour the rest of the cake batter evenly over the apples to cover.
Sprinkle with streusel mixture to cover the top of cake batter evenly.
Bake in oven per instructions on back of cake mix box until cake is golden brown and a toothpick inserted in center comes out clean.
Allow to cool for 10 minutes before serving.