Chocolate Scotcheroos

1 cup sugar
1 cup light corn syrup
1 cup peanut butter
6 cups rice crispies

1 cup chocolate chips
1 cup butterscotch chips

Combine sugar and syrup in a saucepan. Cook over moderate heat, stirring frequently until mixture boils. Remove from heat. Stir in peanut butter, mix well, add rice crispies, stir until well blended. Press mixture into buttered 13 x 9 pan.

Melt chips together. Spread evenly over bars. Cool until firm.