Melt together chocolate chips, butterscotch chips, and peanut butter. Spread one-half of this mixture into a lightly greased 9" x 13" pan. Refrigerate until firm.
Mix together butter, milk, and vanilla pudding mix. Bring to a boil. Remove from heat. Add powdered sugar and maple flavoring and beat until smooth. Spread over chocolate layer which has been in refrigerator.
Add the salted peanuts to the remaining chocolate mixture. Spread over the top of the bars. Keep refrigerated.