My Mom used to make Scotcheroos.

They were really simple:

1 c. sugar
1 c. corn syrup
Bring to boiling and stir in 1 c. peanut butter. Pour over 6 c. Rice Krispies in a bowl and stir to coat. Pour into a greased 9x13 pan and let set until firm. Meanwhile, melt together 6 oz. butterscotch chips and 6 oz. chocolate chips and spread over the bars to coat. Chill until firm and cut into squares. So Good!