Preheat oven to 350ºF. Grease a 9×13 inch pan. Set aside.
In a large bowl, combine cake mix, pie filling, vanilla extract, eggs and milk. Mix with an electric mixer just until combined.
Pour batter into prepared pan. Bake for 25-30 minutes or until toothpick inserted in center comes out clean. Cool.
Beat pudding mix, powdered sugar and milk in large bowl with whisk for 2 minutes.
Stir in Cool Whip and frost cake.
