This is a bar cake similar to a brownie. The butterscotch chips and walnuts sink into the cake giving it the appearance of a hornets nest.
1 Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9×13 inch pan.
2 Bake in preheated oven for 35 to 40 minutes. Cut into squares and serve.
3 Prepare pudding as directed on box. Allow to cool slightly. Mix in yellow cake mix. Stir well. Pour batter into 9×13 cake pan. Sprinkle top with butterscotch chips and chopped walnuts.