Wasp's Nest Cake

1 (18.25 ounce) box yellow cake mix
1 box regular or instant vanilla pudding mix
1 (12 ounce) bag butterscotch chips

Prepare pudding as directed on box. Pour free cake mix into the pudding mixture and stir well. The batter will be thick. Pour mixture into a 9 x 13-inch greased pan. Sprinkle butterscotch chips over batter and bake at 350 degrees F for 30 to 35 minutes.