Combine (for topping) in a small bowl, 1 1/2 cups packed brown sugar and 1T cinnamon. (one cup chopped nuts can be added if you wish) Mix ingredients for easy sprinkling,
In a large bowl, combine:
2 cups flour, 1 cup sugar, 2 tsp. baking powder, 1 tsp. salt, 1 pkg dry INSTANT vanilla pudding mix, 1 pkg. dry INSTANT butterscotch pudding mix, 1 cup water, 3/4 cup salad oil, 1 tsp. vanilla and 4 eggs.
Beat mixture two minutes with electric mixer, scraping bowl frequently. Pour some of the batter into the pan, and sprinkle with some of the topping mixture. Pour remaining batter over and then, sprinkle with remaining topping. I don't fuss with the layering as when it bakes it runs together anyway.
Bake at 350 degrees for 40 to 45 minutes until top springs back when lightly touched in the center. Cool before wrapping in foil. Cut in squares and reheat individual servings just a bit.