Pre-heat oven to 350 degrees. In large saucepan melt butterscotch pieces, sugar and butter over medium heat, stirring constantly. Remove from heat. Add egg; beat well. Add flour, baking powder and salt. Stir in remaining ingredients. Spread in greased 20 cm pan. Bake at 180ºC or 20 to 25 minutes. Cool; cut into bars. Makes 24.